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coSecure https//www.mathxl.com/Student/PlayerTest.aspx2testld-182161384¢erwinsyes; STAT211 7d1 Summer 2018 Test: Midterm exam This Question: 5 pts Tim Hahn ? l 6/20ns 5:35 PM Time Remaining: 00 5940 Submit Test 43 of 20 (0 complete) This Test: 100 pts possible The police department of a major city needs to update its budget. For this purpose, they need to understand the variation in their fines collected limit, a place that in the past has been known for pr a) How many standard deviations from the mean would a car going the speed limit be? b) Which would be more unusual, a car traveling 31 mph or one going 8 mph? ed from motorists for speeding. As a sample, they recorded the speeds of cars driving past a location with a 20 mph speed g fines. The mean of 100 representative readings was 23 84 mph, with a standard deviation of 3.76 mph a) A car traveling at the speed limit is standard deviations from the mean Round to two decimal places as needed ) b) Choose the correct answer below and fill in the answer box(es) to complete your choice O A. The car traveling 8 mph is more unusual itis standard deviations from the mean, while the car traveling 31 mph is standard derviations trom the mean O B. The car traveling 31 mph is more unusual Itis standard deviations from the mean, while the car traveling 8 mph isstandard desviations from the mean O C. Both cars are equally unusual Both cars are standard deviations from the mean (Round to two decimal places as needed ) Round to two decimal places as needed) Round to two decimal places as needed)Explanation / Answer
a)as z score =(X-mean)/std deviaiton=(23.84-20)/3.76=1.02
A car travelling at the spped limit is 1.02 std deviatin from the mean
b)
option A is correct ; the car travelling 8 mph.........it is 4.21 std deviation from.............travelling 31 mph is 1.90 std deviation from...........
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