The weights for a population of North American raccoons have a bell shaped frequency curve with a mean of about 12 lbs. and a standard deviation of about 2.5 lbs. About 95% of the weights fall between what two values? A. 11.75 and 12.25 B. 11.5 and 12.5 C. 2.5 and 12 D. 7 and 17 E. 9.5 and 14.5

Question 2 Bridget surveyed the price of petrol at petrol stations in Cape Town and Durban. The data, in rands per liter are given below. Cape Town 3,96 3,76 4,00 3,91 3,69 3,72 Durban 3,97 3,81 3,52 4,08 3,88 3,68 i. Find the mean price in each city and then state which city has the lower mean. ii. Find the standard deviation of each city's prices. iii. Which city has the more consistently priced petrol? Give reasons for your answer.

Do question 3

If the variance is 140.2, what is the Standard deviation from the following? a. 12.84 b. 15.56 c. 16.56 d. 11.84

Find the range, vanance, and standard deviation for the given sample data. Include appropriate units in the results. Listed below are the measured radiation absorption rates (in Wikg) corresponding to various cell phone models. If one of each model is measured for radiation and the results are used to find the measures of variation, are the results typical of the population of cell phones that are in use? 1.16 0.82 0.51 0.69 1.11 0.82 0.69 0.75 0.52 0.53 1.34

Section 9.2 Homework Progress saved Done 80 8 √ ❤ ⠀ Score: 6/13 7/13 answered 35 Question 8 0/1 pt 3 2 Details In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $39.2 and standard deviation of $2.9. Estimate how much a typical parent would spend on their child's birthday gift (use a 90% confidence level). Give your answers to 3 decimal places. Express your answer in the format of E. Submit Question 13

In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer.The artifact frequency for an excavation of a kiva in Bandelier National Monument gave the following information. Stratum Flaked Stone Tools Nonflaked Stone Tools 1 10 2 2 10 3 3 9 2 4 1 3 5 4 7 6 38 32 7 51 30 8 25 12   What is the value of the sample test statistic? (Round your answer to three decimal places.)

Steve's average golf score at his local course is 92.9 from a random sample of 60 rounds of golf. Assume that the population standard deviation for his golf score is 4.2. The standard error of the mean for this sample is ________. A)  0.54 B)  1.17 C)  1.56 D)  2.30

Can someone please help with D and E? Thank you.

Question 7 く The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 65 ounces and a standard deviation of 8 ounces. Use the Empirical Rule. Suggestion: sketch the distribution in order to answer these questions. a) 95% of the widget weights lie between and b) What percentage of the widget weights lie between 41 and 81 ounces? c) What percentage of the widget weights lie below 73 ? % Question Help: DVideo D Post to forum E Calculator Submit Question ENE