Lifetimes of light bulbs of a particular type
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 280 hours and a standard deviation of 5 hours. What percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?
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A left-tail area in the chi-square distribution equals 0.95. For df=10, the table value equals?
A data set consists of 247 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed. How many scores within this data set should lie within three
A data set consists of 72 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed.
A certain grade egg must weigh at least 2 oz. If the weights of eggs are normally distributed with a mean of 1.5 oz and a standard deviation of 0.4 oz, approximately how many eggs in a random sample of 23 dozen would you expect to weigh more than
Christine is currently taking college astronomy. The instructor often gives quizzes. On the past seven quizzes, Christine got the following scores: 53 10 276 28 12 51 62 Compute the standard deviation(s).
Bottles of juice of one brand are supposed to contain 16 fluid ounces of juice. The table below shows the amount of juice in 60 randomly selected bottles.
At one college, GPA's are normally distributed with a mean of 2.8 and a standard deviation of 0.4. What percentage of students at the college have a GPA between 2.4 and 3.2?
A data set consists of 83 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed. How many scores within this data set should lie between the m
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