Published on 5 Oct 2020

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Practice-Questions: Chapter-6

1) Use the standard normal distribution to find P(0 < z < 2.25).

A) .8817 B) .4878 C) .7888 D) .5122

2) Use the standard normal distribution to find P(-2.25 < z < 0).

A) .4878 B) .0122 C) .5122 D) .6831

3) Use the standard normal distribution to find P(-2.25 < z < 1.25).

A) .8944 B) .4878 C) .0122 D) .8821

4) Use the standard normal distribution to find P(-2.50 < z < 1.50).

A) .6167 B) .5496 C) .9270 D) .8822

5) Use the standard normal distribution to find P(z < -2.33 or z > 2.33).

A) .0198 B) .7888 C) .9809 D) .0606

6) Find a value of the standard normal random variable z, called , such that P(- ≤ z ≤ ) = 0.98.

A) 1.645 B) .99 C) 2.33 D) 1.96

7) Find a value of the standard normal random variable z, called , such that P(z ≥ ) = 0.70.

A) -.81 B) -.47 C) -.98 D) -.53

8) Find a value of the standard normal random variable z, called , such that P(z ≤ ) = 0.70.

A) .53 B) .81 C) .47 D) .98

9) For a standard normal random variable, find the probability that z exceeds the value -1.65.

A) 0.4505 B) 0.5495 C) 0.9505 D) 0.0495

10) For a standard normal random variable, find the point in the distribution in which 11.9% of the z-values fall below.

A) -1.45 B) 1.18 C) -0.30 D) -1.18

11) Suppose a random variable x is best described by a normal distribution with μ = 60 and Find the z-score that

corresponds to the value x = 70.

A) 10 B) 6 C) 1 D) 70

12) Suppose a random variable x is best described by a normal distribution with μ = 60 and Find the z-score that

corresponds to the value x = 84.

A) 6 B) 4 C) D) 24

13) Suppose a random variable x is best described by a normal distribution with μ = 60 and Find the z-score that

corresponds to the value x = 60.

A) 12 B) 1 C) 5 D) 0

14) Suppose a random variable x is best described by a normal distribution with μ = 60 and Find the z-score that

corresponds to the value x = 0.

A) -3.75 B) 16 C) -16 D) 3.75

15) IQ test scores are normally distributed with a mean of 104 and a standard deviation of 16. An individual's IQ score is