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According to a recent national Gallup Poll of U.S. smartphone user, 35% upgrade their cell phone...

According to a recent national Gallup Poll of U.S. smartphone user, 35% upgrade their cell phone every two years. Would be unusual if more than 10 of the 13 smartphone users upgrade their cell phones every two years? Explain why or why not. Support your answer with pertinent probability calculations. include how to compute on ti-84

Math   Statistics-And-Probability   
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Answer #1

Let X denotes the number of smartphone users who upgrade their cell phones every two years out of 13 randomly selected smartphone users.

X ~ Binomial(n = 13, p = 0.35)

The probability mass function of X is

Now,

The probability that  more than 10 of the 13 smartphone users upgrade their cell phones every two years

TI 84 Formula to get P(X < = 10) : DISTR -> B: binomcdf(n = 13, p = 0.35)

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