Question

Assume that when adults with smartphones are randomly selected, 42% use them in meetings or classes. If 15 adult smartphone users are randomly selected, find the probability that fewer than 5 of them use their smartphones in meetings or classes.

Answer #1

Let , X be the number of adults smartphone users who use their smartphones in meeting or classes.

P = 42% = 0.42 , n = 15

X follows Binomial distribution with n = 15 and p = 0.42.

We have to find P( x < 5 )

P( x < 5 ) = P( x <= 4 )

Using Excel function , =BINOMDIST( x , n , p , 1 )

P( x <= 4 ) = BINOMDIST( 4 , 15 , 0.42 , 1 ) = **0.1739**

*Probability that fewer than 5 of them use their smartphones
in meetings or classes is 0.1739*

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