Stats Sem 1 Review

.  The distribution of tests scores for a large statistics class is displayed in the boxplot to the right.  If a score of 70 or above is considered passing, about what percent of students in the class passed the test? a.  25

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The mean birth weight of infants born at a certain hospital in the month of April was 128 oz. with a standard deviation of 10.2 oz.  Which of the following is a correct interpretation of standard deviation?

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Suppose that the heights of adult females have an approximately Normal distribution with a mean of 65 inches and a standard deviation of 3 inches.  If Julie’s height is at the 60^th percentile, how tall is she?

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Using the context from #3, what proportion of adult females will be more than 4 inches from the mean? a.   0

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The following stemplot displays the weights (in pounds) of a random sample of 20 men.  What is the value of the first quartile for these data?

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Suppose that on the most recent test in your statistics class, the mean grade was 71 points with a standard deviation of 13 points.  Your teacher, being extremely merciful and kindhearted, decided to add 5 points to every students’ score.  What are the new mean and standard deviation?

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Some descriptive statistics for a set of test scores are shown below.  For this test, a certain student had a standardized score of z = –1.2.  What score did this student receive on the test?

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