Question

According to Gartner, Inc., 39.2% of mobile phones worldwide use the Android operating system in 2013. A random sample of 30 mobile phone users was selected in 2013. Assuming this estimate is true, use the normal approximation to the binomial distribution to answer the following:
a. Calculate the mean and standard deviation for this distribution.
b. What is the probability that 13 or more of the 30 mobile phone users have an Android operating system?
c. What is the probability that exactly 14 of the 30 mobile phone users have an Android operating system?
d. What is the probability that 7, 8, or 9 of the 30 mobile phone users have an Android operating system?
e. What is the probability that 14, 15, or 16 of the 30 mobile phone users have an Android operating system?


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  • CreatedJuly 17, 2015
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