Question

14. What is the range of the following data set?

7.7, 8.4, 9, 8, 6.9

0.4
0.8
1.4
2.1

Answer 1

range = maximum - minimum

Answer 2

15. Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution. Find the probability that the weight lost is less than 11 pounds
A. 1/6
B. 5/6
C. 5/7
D. 1/3

Answer 3

but for 14 wouldnt it be 2.1?

Answer 4

Yes!

Answer 5

oh i see now ok gotcha

Answer 6

16. Given a mean of 8 and a standard deviation of 0.7, what is the z-score of the value 9 rounded to the nearest tenth?
A. -1.4 B. -1.0 C. 1.0 D. 1.4

Answer 7

17. Provide an appropriate response.

Find the area of the shaded region. The graph depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test).

Answer 8

17. 0.7486
0.6293
0.4400
0.8051

Answer 9

18. Provide an appropriate response.

Find the indicated IQ score. The graph depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test)
119.2
108.1
100.5
80.8

Answer 10

18.

Answer 11

19. Given a mean of 9 and a standard deviation of 2.8, what is the z-score of the value 11 rounded to the nearest tenth?

Answer 12

19.
A. -0.7 B. 0.7 C. 0.9 D. -0.9

Answer 13

use this formula :
\[\text{z score} = \dfrac{\text{observation - mean} }{\text{standard deviation}}\]

Answer 14

\[\text{z score} = \dfrac{\text{11 - 9} }{\text{2.8}} = ?\]

Answer 15

solve for z?

Answer 16

i got a deciaml

Answer 17

\[\dfrac{\text{11 - 9} }{\text{2.8}} = ?\]

Answer 18

what did u get ?

Answer 19

0.71428

Answer 20

thats right! rounding to nearest tenth :
\[0.71428\approx 0.7\]

Answer 21

20. Find the indicated z score. The graph depicts the standard normal distribution with mean 0 and standard deviation 1.

Shaded area is 0.4013

Answer 22

20.

Answer 23

20. A. -0.25 B. -0.57 C. 0.57 D. 0.25

Answer 24

3. If z is a standard normal variable, find the probability.

The probability that z is less than 1.13

0.8485
0.8907
0.1292
0.8708

Answer 25

if you dont mind i have about 4 already answered i just wont you to check

Answer 26

3 being one of them

Answer 27

0.8708

http://www.wolframalpha.com/input/?i=P%28X%3C1.13%29

Answer 28

4. A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. Find the value that is –2 standard deviations away from the mean.

20.1
43.0
61.6
28.4

Answer 29

-2 where it blurs it

Answer 30

see one guy did these earlier and got something else then what u r getting

Answer 31

5. A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. Find the value that is +1 standard deviation away from the mean.

36.7
28.4
53.3
45.0

Answer 32

6. A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. Find the value that is +3 standard deviations away from the mean.

48.0
20.1
78.9
69.9

Answer 33

we already did this in previous post right ?

Answer 34

oh ok

Answer 35

i forgot

Answer 36

2. What is the standard deviation of the following data set rounded to the nearest tenth?

300, 785, 670, 187, 760, 724

571
570
259.1
236.6

Answer 37

for this one i think its c or d

Answer 38

d is correct

Answer 39

cool well you were a lot of help and if you wont for more medals i have another 15 i have to do if u wanna help... up to u though...... THANKS

Answer 40

post as a separate thread and tag me, il try..