32. The long distance calls made by the employees of a company are normally dist
ID: 3338597 • Letter: 3
Question
32. The long distance calls made by the employees of a company are normally distributed with a mean of 6 minutes and a standard deviation of 2 minutes. The probability that a call lasts less than 7 minutes should be
0.1915
0.3085
0.6915
0.8085
33.
The long distance calls made by the employees of a company are normally distributed with a mean of 6 minutes and a standard deviation of 2 minutes. How long does the longest 5% of calls last?
12.1 minutes.
11.6 minutes.
10.5 minutes.
9.3 minutes.
A.0.1915
.B.0.3085
C.0.6915
D.0.8085
Explanation / Answer
32) P(X < 7) = P(Z < (7-6)/2) = P(Z < 0.5) = 0.6915
Option-C) 0.6915
33) Z for top 5% = 1.65
Time of longest 5% = 6 + 1.65 * 2 = 9.3
Option-D) 9.3
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