Question

is this correct?

Answer 1

@Vocaloid

Answer 2

not quite

"more than 3" means 4 bones and 5 bones only

Answer 3

4.5?

Answer 4

nope

Answer 5

look at the graph

Answer 6

how many people broke 4 bones?
how many people broke 5 bones?

Answer 7

0.10 and 0.15

Answer 8

good now add them together

Answer 9

0.25

Answer 10

good that's your answer

Answer 11

@Vocaloid

Answer 12

1 < X < 5 in this case means X = 2,3,4

so add up the probabilities for 2, 3, and 4

Answer 13

still there?

Answer 14

yeah

Answer 15

what did you get?

Answer 16

0.51

Answer 17

good that's your answer

Answer 18

@Vocaloid

Answer 19

first step: add all the frequencies together

20 + 120 + 40 +20 = ?

Answer 20

128

Answer 21

check your math again, your answer should be a multiple of 10

Answer 22

20 + 120 = ?

Answer 23

140

Answer 24

good and 140 + 40 + 20 =?

Answer 25

200

Answer 26

good

now you want to calculate the probability distribution for x = 1,2,3,4 as decimals

Answer 27

20/200 = ?
120/200 =?
40/200 =?
20/200 =?

Answer 28

0.1, 0.6 ,0.2, 0.1

Answer 29

good, those are the numbers you want to put as the heights of the bars

so the first bar should be 0.1, second should be 0.6, etc.

and that's your answer

Answer 30

they only go by fifth's like 0,5 to 0,10

Answer 31

0.1 = 0.10
0.6 = 0.60
0.2 = 0.20
0.1 = 0.10

those marks should be on the bars

Answer 32

ok then

Answer 33

same thing as before, add up the frequencies

4 + 12 + 20 + 32 + 12 = ?

Answer 34

80

Answer 35

good now we calculate the probabilities

4/80 =?
12/80=?
20/80=?
32/80=?
12/80=?

Answer 36

0.4 for the fourth one, thats the only one i need

Answer 37

oh ok, then yes, 0.4 is it

Answer 38

hm

I forgot the shortcut method for this so I would just multiply the numbers and find the 16 possible products (sorry ;_:)

Answer 39

2*3 = ?
2*4 = ?
2*5 = ?
2*6 = ?

Answer 40

6,8,10,12

Answer 41

good

3*3 = ?
3*4 = ?
3*5 = ?
3*6 = ?

Answer 42

9,12,15,18

Answer 43

good

4*3 = ?
4*4 = ?
4*5 = ?
4*6 = ?

Answer 44

still there?

Answer 45

yeah, hang on

Answer 46

12,16,20,24

Answer 47

good, one more set of problems

5*3 = ?
5*4 = ?
5*5 = ?
5*6 = ?

Answer 48

15.20.25.30

Answer 49

good, now let's look over all the numbers we wrote
6,8,10,12
9,12,15,18
12,16,20,24
15,20,25,30

we have 5 numbers that are between 12 and 15 so I believe 5/16 would be our answer

Answer 50

A veterinarian is using a new vaccine for cats. The vaccine has a 10% probability of causing side effects.

In which distributions does the variable X have a binomial distribution?

Select each correct answer.



When the vaccine is given to three cats, X is the number of cats that have side effects.

When the vaccine is given to six cats, X is the number of cats that do not have any side effects.

When the vaccine is given to multiple cats, X is the total number of cats that receive the vaccine.

When the vaccine is given to multiple cats, X is the number of cats that receive the vaccine until one of them has side effects.

Answer 51

woah, that shouldnt be big...

Answer 52

since there are two outcomes for each cat (side effects vs. no) I believe it would just be the first two choices

Answer 53

hint: 75% of the data is below what value on the x-axis?

Answer 54

5?

Answer 55

not quite. 100% of the data is below 5 since the entire blue bar is below 5

what about 75% of the data? if you cut vertically through the boundary between the bottom 75% of the data and the top 25% what number do you hit on the x-axis?

Answer 56

like this:

Answer 57

4

Answer 58

good so your answer is 4

Answer 59

I'm not 100% sure but things that occur in nature tend to be normally distributed

so heights and weights definitely yes, and number of rooms definitely not. I'm not sure about number of babies born but I would say yes.

Answer 60

The heights of the peach trees in an orchard are normally distributed with a mean of 12.5 feet and a standard deviation of 1.8 feet.

What is the height of a peach tree with a z-score of −0.5−0.5 ?

Enter your answer, rounded to the nearest tenth, in the box.

Answer 61

-0.5 = (height-mean)/standard deviation

solve for height

Answer 62

hmm...

Answer 63

this is tricky

Answer 64

take the numbers from the problem and plug them into the equation

Answer 65

-0.5 = (height-mean)/standard deviation

-0.5 = (height-12.5)/1.8

height = ?

Answer 66

i still dont get it...

Answer 67

yeah, im still stumped

Answer 68

multiply both sides by 1.8

Answer 69

-0.5*1.8 = height-12.5

height = ?

Answer 70

-0.9?

Answer 71

getting there

Answer 72

-0.9 = height - 12.5

height = ?

Answer 73

2.6?

Answer 74

-0.9 + 12.5 = ?

Answer 75

11.6

Answer 76

good that's it

Answer 77

wait

Answer 78

is it actually written as "−0.5−0.5 ?" as the z-score?

Answer 79

in that case you would re-do the calculation with the z-score as -1

Answer 80

-1 = (height - 12.5)/1.8

height = ?

Answer 81

11.6?

Answer 82

no, I said to re-do the calculation with z-score = -1 not -0.5

again, multiply both sides by 1.8

Answer 83

-1 = (height - 12.5)/1.8

-1.8 = height - 12.5

height = ?

Answer 84

@princeevee are you still there?

Answer 85

yeah

Answer 86

-1.8 = height - 12.5

height = ?

Answer 87

you are just solving for an unknown variable

Answer 88

11.3?

Answer 89

how do we get "height" by itself if we have "height - 12.5" on the right side?

Answer 90

we add the left then minus the ammount

Answer 91

???

Answer 92

what is the "opposite" of subtraction?

Answer 93

we add -1.8 to 12.5 then minus it

Answer 94

Forget -1.8 for a minute

Answer 95

if we have height - 12.5

how do we get "height" by itself?

Answer 96

what is the "opposite" of subtracting 12.5?

Answer 97

adding.

Answer 98

good, so if we have "height - 12.5" we can do the opposite of - 12.5 and add 12.5 to get

height - 12.5 + 12.5 = height

make sense?

Answer 99

25.0

Answer 100

no

Answer 101

height - 12.5 + 12.5 = height

make sense?

Answer 102

yeah

Answer 103

so if we add 12.5 on one side we must add 12.5 on the other side

Answer 104

ok

Answer 105

-1.8 + 12.5 = height = ?

Answer 106

10.7 is what i got

Answer 107

good, that should be your answer

Answer 108

Use technology or a z-distribution table to find the indicated area.

The masses of the eggs collected on a farm are normally distributed with a mean of 55 grams and a standard deviation of 4.2 grams.

Approximately 80% of the eggs on the farm have a mass greater than which mass?



51.5 g

54.1 g

55.8 g

58.5 g

Answer 109

I used my calculator to find the z-square value corresponding to 80% which is 0.842 (InvNorm)

so let's solve:

0.842 = (x-mean)/standard deviation

let me know if you are having trouble

Answer 110

lets see....

Answer 111

i tried doing it and i got C, is that right?

Answer 112

0.842 = (x-mean)/standard deviation

0.842 = (x - 55)/4.2

x = ?

Answer 113

hmm...

Answer 114

multiply both sides by 4.2

Answer 115

0.842*4.2 = (x - 55)

Answer 116

x = ?

Answer 117

3.5364

Answer 118

if we have x - 55
how can we get "x" by itself?

Answer 119

...

Answer 120

what's the opposite of subtracting 55?

Answer 121

adding

Answer 122

adding what number?

Answer 123

...

Answer 124

if we have a hole that is 55 feet deep, then how much dirt do we have to add to fill up the hole?

Answer 125

do you take me as an idiot?

Answer 126

no

Answer 127

kinda sounds like you do

Answer 128

I'm sorry I was just losing my temper

Answer 129

i can just do these myself