题目
the weights of egge produced on a farm are normally distributed with a mean of 1.4 ounces and a standard deviation of 0.4 ounces
1.what percent of the eggs weight at least 1 ounce?
2.how many of 1200 eggs are withiin 2 standard deviations of the mean?
3.to be a graded extra large,an egg must weight at least 2.2 ounces.what is the probability that an egg from this form will be graded extra large?
1.what percent of the eggs weight at least 1 ounce?
2.how many of 1200 eggs are withiin 2 standard deviations of the mean?
3.to be a graded extra large,an egg must weight at least 2.2 ounces.what is the probability that an egg from this form will be graded extra large?
提问时间:2020-09-29
答案
1、84.13%
2、0.6826×1200=819.12≈819个
3、0.0228
2、0.6826×1200=819.12≈819个
3、0.0228
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