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Exercise 7-9 Algo 7.5 A random sample of size n = 66 is taken from a population with mean / = -12.5 and standard deviation o= 6. [You may find it useful points to reference the z table.] a. Calculate the expected value and the standard error for the sampling distribution of the sample mean. (Negative values should be indicated by a minus sign. Round "expected value" to 1 decimal place and "standard error" to 4 decimal places.) Book Expected value References Standard error b. What is the probability that the sample mean is less than -13? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.) Probability c. What is the probability that the sample mean falls between -13 and -12? (Do not round intermediate calculations. Round "z" value to 2 decimal places and final answer to 4 decimal places.) Probability