Question

-1 points RolFM8 8.7.074 Assume normal distribution in the following exercise. Find the value of z. (Round your answer to two decimal places.) The probability that a score is between z and -z is 0.84. Need Help? ReedtTaik to Titer -13 points RoltFM8 8.7.075 For the binomial distribution, compute the mean, variance, and standard deviation. (See Example 17, For standard deviation, round your answer to two decimal places n=50, p = 0.8 mean variance standard deviation Need Help? İin..ana

Answer 1

(a)

Probability that a score is between z and - z is 0.84.

So,

Area from mid value to Z on either side = 0.42

Table of Area Under Standard Normal Curve gives Z = 1.405.

So,

Answer is:

1.405

(b)

n = 50

p =0.8

q = 0.2

Mean = np = 50 X 0.8 = 40

Variance = npq = 50 X 0.8 X 0.2 = 8

standard deviation = = 2.8284