Answer:
The mean of X is 1.17.
The standard deviation of X is 1.009.
Step-by-step explanation:
<em>The question is incomplete: 1ean and Standard Deviation of Senior Citizens In the 2010 US Census, we learn that of all people in the US </em><em>13% </em><em>are senior citizens. Let the random variable X represent the number of senior citizens in a random sample of 9 people. Find the mean and standard deviation of this random variable. Enter the exact answer for the mean, and round your answer for the standard deviation to three decimal places.</em>
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This variable X can be modeled as a binomial random variable, with n=9 and p=0.13.
The mean of X is:
The standard deviation of X is: