Question

@ranga hi do you know how to do probability stuff?

Answer 1

Yes

Answer 2

I don't understand this, like questions 6-10

Answer 3

Number 6 is asking how many times will you roll a 6 out of 40?

Answer 4

i think so

Answer 5

i don't really know :(

Answer 6

Hm. I quite forgot this. I use to be good on this lol.

Answer 7

lol yeah it's confusing me

Answer 8

Sorry, problem some one could help you. Just bump your question again.

Answer 9

probably*

Answer 10

okey

Answer 11

Experimental probability of rolling a 6 =
No. of times 6 was rolled / Total no. of times the dice was rolled = ?

Answer 12

The table tells you how many times 6 was rolled.
The problem also tells you the total number of times the dice was rolled.
Just plug the two numbers into the above formula.

Answer 13

6=40/4?

Answer 14

The other way around. You have switched top and bottom.

Answer 15

P(rolling a 6) = 4 / 40 = 1 / 10

Answer 16

oh you're smart

Answer 17

thanks :)

Answer 18

You are welcome.
For #7, first find P(rolling a 3) (use similar method as #6).
Then P(NOT rolling a 3) = 1 - P(rolling a 3)

Answer 19

I don't understand

Answer 20

In #6 we found P(rolling a 6). Use the same method first to find P(rolling a 3).
DO that first and then we will do the next step.

Answer 21

P(rolling a 3) = No. of times 3 was rolled / Total no. of times the dice was rolled = ?

Answer 22

No. of times 3 was rolled is given in the table.
Total no. of times the dice was rolled is given in the problem.
Plug the two numbers into the above formula.

Answer 23

2/40=

Answer 24

?

Answer 25

Yes and you can simplify 2/40.

Answer 26

Two will go into both numerator and the denominator. So to simplify the fraction divide both the numerator and the denominator by 2.

Answer 27

1/20

Answer 28

whoa

Answer 29

Yes. P(rolling a 3) = 1/20. Whenever you know the probability of an event happening then you can easily find the probability of the event NOT happening by subtracting the probability from 1.
P(NOT rolling a 3) = 1 - P(rolling a 3) = 1 - 1/20 = ?

Answer 30

1-1/20=.95?

Answer 31

the decimal answer is correct. But subtract the fraction 1/20 from 1 and keep it as a fraction.

Answer 32

how does that look?

Answer 33

a - b/c = (ac - b) / c
1 - 1/20 = (1*20 - 1)/20 = ?

Answer 34

To add or subtract fractions you will have to make the denominators the same. After that you can add or subtract the numerators.
1 - 1/20. To make the denominators the same, we can write 1 as 20/20.
So 20/20 - 1/20 = (20-1)/20 = 19/20

Answer 35

that looks confusing no offense

Answer 36

See if the method in my previous reply is easier to understand.

Answer 37

i get understand that way when you put 20/20-1/20=19/20

Answer 38

i meant to say 'i understand'

Answer 39

okay, the answer to 7 is 19/20.

Answer 40

thank you

Answer 41

#8. P(rolling an even number)
What are the even numbers in a dice?

Answer 42

2,4,6?

Answer 43

Yes. P(rolling an even number) = P(2 or 4 or 6) = P(2) + P(4) + P(6) ---- (1)
In #6 I showed you how to find P(6) and so we can use that same number in equation (1). Find P(2) and P(4) using the same method and plug it into equation (1).

Answer 44

hmm

Answer 45

for some reason im confused by the look of it

Answer 46

it's just plugging in right?

Answer 47

Probability of rolling an even number = Probability of rolling a 2 or a 4 or a 6 =
Probability of rolling a 2 + Probability of rolling a 4 + Probability of rolling a 6.

From #6 we already know P(6) = 1/10.
You just need to find P(2) and P(4)
P(2) = No. of times 2 was rolled / Total no. of times the dice was rolled = ?
P(4) = No. of times 4 was rolled / Total no. of times the dice was rolled = ?

(I will have to leave shortly. Let us finish #8)

Answer 48

oh If you have to leave it's ok, i can ask another person

Answer 49

thanks for the help

Answer 50

You are welcome. Go through what we did in #6 to find P(6). Use the same method to find P(2) and P(4). Then just add P(2) + P(4) + P(6) to get your answer for #8.

Answer 51

thanks