Question
Asked Nov 14, 2019
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Need the answer to question 6. 

Suppose the number of cell phone calls made or received per day by cell phone users follows a
normal distribution with a mean of 13.1 and a standard deviation of 4.3. Use this information to
answer questions 6-9
6) Find P(x< 12)
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Suppose the number of cell phone calls made or received per day by cell phone users follows a normal distribution with a mean of 13.1 and a standard deviation of 4.3. Use this information to answer questions 6-9 6) Find P(x< 12)

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Expert Answer

Step 1

(6)

The provided information are:

Population mean (u) = 13.1
Population standard deviation (o 4.3
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Population mean (u) = 13.1 Population standard deviation (o 4.3

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Step 2

Consider, x be the random variable that represents the number of calls made or received per day is normally distribut...

12-
x -
P(x < 12) P
12-13.1
= P z<
4.3
=P(z<-0.256)
-1-P(z < 0.256)
(From standard normal table
1-0.6026
=0.3974
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12- x - P(x < 12) P 12-13.1 = P z< 4.3 =P(z<-0.256) -1-P(z < 0.256) (From standard normal table 1-0.6026 =0.3974

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