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Probability Assignment | Professional Writing Services

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December 13th, 2019

sociates report that calls from customers over the age of 40 make up the bulk of the longer calls and that 35% of customers fall in the over 40 age group. The company chooses 25 randomly selected customers. If appropriate, what is the approximate probability that as few as 4 but no more than 12 of these customers are 40 years old or older?

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A. =NORM.DIST(12, 25, 0.35, 1) – NORM.DIST(4, 25, 0.35, 1)

B. =NORM.DIST(11.5, 8.75, 2.38, 1) – NORM.DIST(3.5, 8.75, 2.38, 1)

C. =NORM.DIST(12.5, 25, 0.35, 1) – NORM.DIST(4.5, 25, 0.35, 1)

D. =NORM.DIST(12.5, 8.75, 2.38, 1) – NORM.DIST(3.5, 8.75, 2.38, 1) E. It is not appropriate to approximate this probability using the normal. 

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