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lcdavis16
25.07.2019 •
Mathematics
In a certain normal distribution, 6.3% of the area lies to the left of 36 and 6.3% of the area lies to the right of 42. find the mean and the standard deviation ?
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Ответ:
As the normal distribution is symmetric the mean is (36 + 42) / 2 = 39
p(X < 42) = 1 - 0.063 = 0.937
From tables Φ (1.53) = 0.9370
From this time:
42 is 1.53 standard deviations above the mean
42 = 39 + 1.53s
1.53s = 3
Standard deviation is = 1.96
Ответ:
Hi there!
The correct answer will be: 123.565
Step-by-step explanation:
Any time they ask you to round to the nearest thousand, it means there will be three digits behind the decimal