Question 911786: AA 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 stanbon(75887)   (Show Source):
You can put this solution on YOUR website! AA 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)
Binomial Problem with n = 20 and p(have smartphone) = 0.56
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(2) state the formula
P(x = k) = 20Ck(0.56)^k*(0.44)^(20-k)
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Your Problem::
P(0<= x <=4) = binomcdf(20,0.56,4) = 0.0011
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Cheers,
Stan H.
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