Question

During a typical day, 58% of people in the US with Internet access go online to...

  1. During a typical day, 58% of people in the US with Internet access go online to get the news. In a random sample of 80 people, use an Excel function to find the binomial probability that the number of people that go online to get the news is
    1. 44 or less
    2. exactly 45
    3. more than 50

Then, Find the mean and standard deviation of the binomial distribution. Show the use of the special formulas.

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

a,b and c are calculated using excel and refer the following

n 80
P(Internet access) 0.58
P(No Internet access) 0.42
X=No of people having Internet access
P(X<=44) 0.33179067
P(X=45) 0.085244838
P(X>50) 0.176758837
Excel Has a function binom.Dist
Arguments
Number_s Number of successful trials 44 45 50
trials Number of trials 80
Probability of success P(S) 0.58

mean of binomial distribution

Standard deviation =

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