The average score of all pro golfers for a particular course has a mean of 70 and a standard deviation of 3.0. Suppose 36 golfers played the course today. Find the probability that the average score of the 36 golfers exceeded 71.
Let denotes the average score of 36 golfers played the course today.
Since sample size is large enough ( > 30), we can approximate the sampling distribution of sample mean by normal distribution.
So, we can write
or
Now,
The probability that the average score of the 36 golfers exceeded 71
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