SOLUTION: A recent survey found that 56% of mobile phone users, between the ages of 18 to 34, had
a smartphone. Suppose a random sample of 20 mobile phone users were selected. What is
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a smartphone. Suppose a random sample of 20 mobile phone users were selected. What is
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Question 914108: A recent survey found that 56% of mobile phone users, between the ages of 18 to 34, had
a smartphone. Suppose a random sample of 20 mobile phone users were selected. What is
the probability that less than 5 of them have a smartphone? [Ensure that you (1) clearly
denote the probability distribution and its parameter(s) and (2) state the formula] Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! p(had) = .56, n = 30
P( x < 5) = binomcdf(30, .56, 4) 0r P( x < 5) = P(0) + P(1) + P(2) + P(3) + P(4)
.............
Using Binomial Distribution formula:
Using
p and q are the probabilities of success and failure respectively.
In this case p = .56 & q = .44, n = 30
