The time spent studying (in hours) for the final exam by students in a certain university has unknown mean μ and standard deviation 8 hours. A random sample of 4 students was taken to guess the mean study time of all students in the university. What is the (approximate) probability that the sample mean X differs from the population mean u by less than 4 hours? That is, approximate P(|X − µ| < 4). (Hint: Recall that |x| ≤ a means that –a ≤ x ≤ a.) -

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