Question 18 0 out of 5 points The waking time of a student under common conditio

Question

Question 18 0 out of 5 points The waking time of a student under common conditions is normally distributed with mean of 30 hours and a standard deviation of 5 hours. what value of waking hours is exceeded with 95% probability? Selected Answer 43.16 21.77 43 16 36 42 2357 Answers: Question 19 0 out of 10 points The width of Pandora's box is normally distributed with a mean of 15 inches and a standard deviation of 0.3 inch. The depth of Pandora's box is normally distributed with a mean of 14 inches and a standard deviation of 0.4 inch. Assume independence. What is the probability that the width of Pandora's bax minus the depth of Pandora's box exceeds 1 inch? Selected Answer 025 Answers 0.25 0.50

Explanation / Answer

As per the Chegg policy, we are advised to do one question at a time so i am attempting the 18th one.

18. The z score corresponding to 5% area to its left = 95% area to its right = -1.645

Hence,

Working hours value that is exceeded with 95% probability

= 30 - 1.645(5)

= 21.77

Option A is correct.

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