The average number of students graduating per year from a university for the past 5 years is 1,000 with a standard deviation 140. This year 1,248 students graduated from the university. Is this an unusual number? No O Yes

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National park services, a bureau of the US government responsible for park management, is interested in how the scores of their park rangers today are better or worse than in the past. The cognitive test that the forest rangers take as remained the same over the last five years. Below are the scores for each year, compute the mean, median, mode, range, and standard deviation for each year. ​       ​Current Year 56, 45, 64, 75, 87, 81, 69, 81, 58, 92, 99, 95, 75, 92, 73, 83, 47, 69, 57, 74, 62, 74, 73, 100, 83   Five Years Ago 66, 78, 75, 79, 59, 74, 55, 89, 55, 79, 68, 27, 69, 95, 68, 90, 65, 79, 69, 79, 87, 86, 98, 81, 96

On the SAT, the average Writing score is 490 points and the average Math score is 547 points. The standard deviation is 89 points on each part of the test. Now suppose 61 test takes are selected.  14% of the time the sample average Math score should be less than what? (Round to four decimals)

A golf pro claims that his mean golf score is 63. A sportswriter wants to test the claim that his mean score is higher 63. Would this be a left-tailed, right-tailed, or two-tailed test?

The mean score on a set of 28 tests is 75. What is the sum of all the test​ scores?

Suppose the the high temperatures recorded during each of the past 5 days (in Fahrenheit) are as follows: 70, 85, 91, 77, and 82. Find the mean and standard deviation of these temperatures.

On a multiple choice test with 10 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the number of correct answers.

Compute the mean of 80, 60, 82, 48, 54, 76, 71. Round to 2 decimal places as needed   Your Answer:

The GRE is a test required for admission to many U.S. graduate schools. Students' scores on the quantitative portion of the GRE follow a normal distribution with a min of 150 and a standard deviation of 8.8. An admissions officer at a large graduate school believes the mean is less than 150. What kind of test is this? Two-tailed Left-tailed Right-tailed