myopenmath.com C + Question 1 0/1 pt 95 2 4 0 Details The student council is hosting a drawing to raise money for scholarships. They are selling tickets for $9 each and will sell 900 tickets. There is one $2,000 grand prize, four $200 second prizes, and thirteen $40 third prizes. You just bought a ticket. Find the expected value for your profit. Round to the nearest cent. Question Help: B Written Example Message instructor Submit Question Jump to Answer( >i E] i . myopenmathsom Ci ' o H [1'] ' ii] I o Question2 v ' ' 30/1 pt '0 5 34 (D Details 26% of all college students major in STEM (Science, Technology, Engineering, and Math). If 45 college students are randomly selected, find the probability that a. Exactly 13 of them major in STEM. c. At least 13 of them major in STEM. b. At most 10 of them major in STEM. [:] d. Between 9 and 17 (including 9 and 17) of them major in STEM. [3 Round all answers to 4 decimal places. Question Help: E] Video [9 Written Example 8 Message instructor myopenmath.com The time to complete an exam is approximately Normal with a mean of 51 minutes and a standard deviation of 5 minutes. The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equal to the standard deviation. Fill in the indicated boxes. [130 u-Za [1-0 '1 [1+0 \"+20 \"+30 \"HUIINN\" Question Help: Q Written Example 8 Message instructor Jumpmnswer ' E] ' myopenmathcom C 0 [1'] I5] i 0 Question 7 v 8 0/1 pt '0 5 Z The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 120 residents whose mean number of pounds of trash generated per person per week was 33.9 pounds and the standard deviation was 6.8 pounds. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. b. With 90% confidence the population mean number of pounds per person per week is between [:] and C] pounds. c. If many groups of 120 randomly selected members are studied, then a different confidence interval would be produced from each group. About C] percent of these confidence intervals will contain the true population mean number of pounds of trash generated per person per week and about C] percent will not contain the true population mean number of pounds of trash generated per person per week. Question Help: I; Written Example 8 Message instructor Submit Question Jump to