# Question: The standard deviation of the 2011 gross sales of all

The standard deviation of the 2011 gross sales of all corporations is known to be $139.50 million. Let be the mean of the 2011 gross sales of a sample of corporations. What sample size will produce the standard deviation of equal to $15.50 million? Assume n/N < .05.

## Answer to relevant Questions

Consider the sampling distribution of given in Table 7.5. a. Calculate the value µ of using the formula µ = ∑P(). Is the value of µ calculated in Exercise 7.6 the same as the value of µ calculated here? b. ...The GPAs of all 5540 students enrolled at a university have an approximately normal distribution with a mean of 3.02 and a standard deviation of .29. Let be the mean GPA of a random sample of 48 students selected from this ...If all possible samples of the same (large) size are selected from a population, what percentage of all the sample means will be within 1.5 standard deviations (σ) of the population mean? The GPAs of all students enrolled at a large university have an approximately normal distribution with a mean of 3.02 and a standard deviation of .29. Find the probability that the mean GPA of a random sample of 20 students ...As mentioned in Exercise 7.33, among college students who hold part-time jobs during the school year, the distribution of the time spent working per week is approximately normally distributed with a mean of 20.20 hours and a ...Post your question