Question Details

A study of long-distance phone calls made from General Electric Corporate Headquarters in Fairfield,

Connecticut, revealed the length of the calls, in minutes, follows the normal probability distribution. The

mean length of time per call was 4.70 minutes and the standard deviation was 0.50 minutes.

a. What fraction of the calls last between 4.70 and 5.50 minutes? (Round z-score computation to 2

Fraction of calls

b. What fraction of the calls last more than 5.50 minutes? (Round z-score computation to 2 decimal

Fraction of calls

c. What fraction of the calls last between 5.50 and 6.00 minutes? (Round z-score computation to 2

Fraction of calls

d. What fraction of the calls last between 4.00 and 6.00 minutes? (Round z-score computation to 2

Fraction of calls

e. As part of her report to the president, the director of communications would like to report the length of

the longest (in duration) 3 percent of the calls. What is this time? (Round z-score computation to 2

Duration

A P (4.7 &lt; X &lt; 5.5) Normal Distribution, ? = 4.7, ? = 0.5, we convert this to standard normal using

x??

z=

?

4.7 ? (4.7)

= 0.00

z1 =

0.5

5.5 ? (4.7)

z2 =

= 1.60

0.5

P (0.00 &lt; Z...

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This question was answered on: Sep 18, 2020

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