Mean and standard deviation for the random variable
From the probability distribution, find the mean and standard deviation for the random variable x, which represents the number of cars per household in a town of 1000 households.
x P(x)
0 0.125
1 0.428
2 0.256
3 0.108
4 0.083
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Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $31,000 and a standard deviation of $3000. If 100 teachers are randomly selected, find the probability that their mean salary is le
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