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1)    A) A market researcher analyzes how many electronics devices customers buy in a single...

1)

   A) A market researcher analyzes how many electronics devices customers buy in a single purchase. The distribution has a mean of three with a standard deviation of 0.7. She samples 400 customers. What is the z-score for Σx = 1,186? (Enter an exact number as an integer, fraction, or decimal.)

   B) An unknown distribution has a mean of 100, a standard deviation of 100, and a sample size of 100. Let X = one object of interest.
What is P(Σx > 9,300)? (Round your answer to four decimal places.)

   C) The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.
Find the 85th percentile for the total length of time 64 batteries last. (Round your answer to the nearest whole number.)

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