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The mean number of minutes for app engagement by a table user is 7.5 minutes. Suppose...

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Basic Math

The mean number of minutes for app engagement by a table user is7.5 minutes. Suppose the standard deviation is 1.25 minutes. Take asample of 80.

a. What are the mean and standard deviation for the sample meannumber of app engagement by a tablet user?

b. Find the 90th percentile for the sample mean time for appengagement for a tablet user. Interpret this value in a completesentence.

c. Find the probability that the sample mean is between 7 and7.75 minutes.

d. What are the mean and standard deviation for the sums?

e. Find the 90th percentile for the sum of the sample. Interpretthis value in a complete sentence.

f. Find the probability that the sum of the sample is at least10 hours.

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