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1. A recent study estimates that 45% of iPhone users still have their phone within 2...

1. A recent study estimates that 45% of iPhone users still have their phone within 2 years of purchasing it. Suppose you randomly select 30 iPhone users. Let random variable X denote the number of iPhone users who still have their original phone after 2 years.

A) Describe the probability distribution of X (Hint: hive the name of the distribution and identify n and p)
B) Find the expected value of X. Round to 1 decimal place
C) Find the standard deviation of X. Round to 3 decimal places
D) Determine the probability that X equals 13. Round to 3 decimal places.


D) Determine the probability that EXACTLY 11 iPhone users still have their original phone after 2 years. Round to 3 decimal places.
E) Determine the probability that at most 5 iPhone users still have their original phoen after 2 years. Round to 3 decimal places
F) Determine the probability that at least 8 iPhone users still have their original phone after 2 years. Round to 3 decimal places.
G) Determine the probability that between 6 and 9 iPhone users still have their original phone after 2 years. Round to 3 decimal places.
math   Statistics-And-Probability   
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