A survey among freshman at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that the average time spent studying for the sample was between 26.2 and 30 hours studying?
Write only a number as you answer. Round to 4 decimal places.
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Use same process, but calculate both Z scores first, then use the table.
1 answer