Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 60 and standard deviation 8. How many students...

Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 60 and standard deviation 8. How many students would have to take the examination to ensure, with probability at least 0.94, that the class average would be within 1.5 of 60?