Please help with this 3 part problem. (Please this is my last question of this period It would mean the world)

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Please help with this 3 part problem. (Please this is my last
question of this period It would mean the world)

Please Help With This 3 Part Problem Please This Is My Last Question Of This Period It Would Mean The World 1 (67.7 KiB) Viewed 20 times

Find the mean of the data summarized in the given frequency distribution. Compare the computed mean to the actual mean of 47.4 miles per hour. Speed (miles per hour) 42 – 45 46-49 50 - 53 54 - 57 58 - 61 Frequency 24 12 6 4. 2 miles per hour. The mean of the frequency distribution is (Round to the nearest tenth as needed.)

A tire company produced a batch of 6,800 tires that includes exactly 230 that are defective. a. If 4 tires are randomly selected for installation on a car, what is the probability that they are all good? b. If 100 tires are randomly selected for shipment to an outlet, what is the probability that they are all good? Should this outlet plan to deal with defective tires returned by consumers? a. If 4 tires are randomly selected for installation on a car, what is the probability that they are all good? (Round to three decimal places as needed.)

Several psychology students are unprepared for a surprise true/false test with 20 questions, and all of their answers are guesses. a. Find the mean and standard deviation for the number of correct answers for such students. b. Would it be unusual for a student to pass by guessing (which requires getting at least 12 correct answers)? Why or why not? a. u = (Do not round.)