In a sample of 1000 cases, the mean of a certain test is 14 and S.D is 2.5. Assuming the distribution to be normal, find
(1) how many students score between 12 and 15?
(2) How many score above 18?
(3) how many score below 8?
(4) how many score 16?
In a sample of 1000 cases, the mean of a certain test is 14 and S.D is 2.5. Assuming the …
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