According to a recent poll, about 40% of Americans believe in ghosts. Assuming this percentage is accurate, suppose 20 people were randomly selected and asked if they believe in ghosts and the number saying they do is recorded. (a) Explain why this is a binomial experiment. (b) Find the probability that exactly 9 of those asked believe in ghosts. Do not use statistical features of your calculator. (c) Find the probability that at least 10 of those asked believe in ghosts. You may use any features of your calculator. (d) Find the probability that between 7 and 12 people believe in ghosts inclusive. (e) Compute and interpret the mean number of people that believe in ghosts. (f) Compute the standard deviation for the number of people that believe in ghosts.
According to a recent poll, about 40% of Americans believe in ghosts. Assuming this percentage is accurate, suppose 20 people were randomly selected and asked if they believe in ghosts and the number saying they do is recorded.
(a) Explain why this is a binomial experiment.
(b) Find the
(c) Find the probability that at least 10 of those asked believe in ghosts. You may use any features of your calculator.
(d) Find the probability that between 7 and 12 people believe in ghosts inclusive.
(e) Compute and interpret the mean number of people that believe in ghosts.
(f) Compute the standard deviation for the number of people that believe in ghosts.
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