Use the Empirical Rule to determine your answer. A small computing center has found that the number of jobs submitted per day to its computers has a distribution that is approximately bell shaped, with a mean of 75 jobs and a standard deviation of 8. Where do we expect most (approximately 95%) of the distribution to fall? between 51 and 99 jobs per day between 59 and 99 jobs per day between 59 and 91 jobs per day between 67 and 83 jobs per day

2. This is a sample of 10 random seasons in the National Hockey League, Wayne Gretzky scored 50% more points than anyone who ever played professional hockey. He accomplished this amazing feat while playing in 280 fewer games than Gordie Howe, the previous record holder. Here are the number of games Gretzky played during each season.45 70 73 73 74 78 79 80 80 82 a. Find the mean and standard deviation for the data above. (You do not need to show work, use technology as needed especially for standard deviation).b. Find the five-number summary.

Which statement about the normal distribution is false? Approximately 68 % of the data lie within 1 standard deviation of the mean. Approximately 99.7% of the data lie within 3 standard deviation of the mean. None of these is true. Approximately 95% of the data lie within 2 standard deviation of the mean. SAMSUNG C Oll % & ★

Motorcycles. The number of motorcyclists killed in motor vehicle traffic crashes in the U.S. in a 7 year span is below. Round your answers to 1 decimal place. 4848 4946 4688 5097 4769 4816 4907 a. Find the mean. deathsb. Find the standard deviation. deaths

The National Football League (NFL) polls fans to develop a rating for each football game. Each game is rated on a scale from 0 (forgettable) to 100 (memorable). The fan ratings for a random sample of 12 games follow. 58 60 85 75 71 72 20 57 79 79 83 74 a. Develop a point estimate of mean fan rating for the population of NFL games (to 2 decimals). b. Develop a point estimate of the standard deviation for the population of NFL games (to 4 decimals).

The National Football League (NFL) polls fans to develop a rating for each football game. Each game is rated on a scale from 0 (forgettable) to 100 (memorable). The fan ratings for a random sample of 12 games follow. 56 60 86 75 72 72 21 57 81 79 83 73 a. Develop a point estimate of mean fan rating for the population of NFL games (to 2 decimals). b. Develop a point estimate of the standard deviation for the population of NFL games (to 4 decimals).

2000 freshmen at State University took a biology test. The scores were distributed normally with a mean of 70 and a standard deviation of 5. Answer the following questions based on the data. (Don't forget to put the %) 0.0015 55 02351 60 0135 65 0.34 0.34 70 0.135 75 Type a response 10.023 80 * 0.0015 ✓ 85 21. What percentage of scores are between 65 and 75? (Don't forget to put the %) 1

The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 44 and a standard deviation of 11. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 22 and 55?Do not enter the percent symbol.ans = ___________ %

Salaries for teachers in a particular elementary school district are normally distributed with a mean of 42,000ドル and a standard deviation of 6,200ドル. We randomly survey 10 teachers from that district. Part (a) + Part (b) O Part (c) Part (d) Part (e) E Part (f) O Part (g) Find the 90th percentile for an individual teacher's salary. (Round your answer to the nearest whole number.) $ O Part (h) Find the 90th percentile for the average teachers' salary. (Round your answer to the nearest whole number.) $ Part (i) Part (j) O Part (k) Find the probability that an individual teacher earns more than 39,000ドル. (Round your answer to four decimal places.) O Part (1) Find the probability that the average salary for the sample is more than S39,000. (Round your answer to four decimal places.) Additional Materials Reading

A statistician wants to estimate the mean loss suffered by Delta pilots in the labor negotiations to lower Delta salaries to within 2500ドル with 95% confidence. From a first small survey, the standard deviation of the loss is estimated at 10,000ドル. What size sample should the statistician select? 1206 44 7 None of the above

Approximate the mean and standard deviation for age.

Esp Heavy children: Are children heavier now than they were in the past? The National Health and Nutrition Examination Survey (NHANES) taken between 1999 and 2002 reported that the mean weight of six-year-old girls in the United States was 49.3 pounds. Another NHANES survey, published in 2008, reported that a sample of 193 six-year-old girls weighed between 2003 and 2006 had an average weight of 52 pounds. Assume the population standard deviation is o =16 pounds. Can you conclude that the mean weight of six-year-old girls in 2006 is different from what it was in 2002? Use the a =0.01 level of significance and the critical value method. 00 Part: 0/ 5 Part 1 of 5 (a) State the appropriate null and alternate hypotheses. H.: OD O=0 dl. H : This hypothesis test is a (Choose one) test. 00

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