Assume the random variable X is normally distributed with mean = 50 and standard deviation = 7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded P(57 ≤x≤67) Which of the following normal curves corresponds to P(57 ≤X ≤67)? MA 50 57 67 Q d P(57 ≤x≤67)= (Round to four decimal places as needed.) B. 50 57 67 CAD 4 Q ✓ 50 57 67 od

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Assume the random variable X is normally distributed with mean μ = 50 and standard deviation o = 7. Compute the probability. Be sure to draw a normal curve with the area corresponding to the probability shaded. P(34 < X <60) Click the icon to view a table of areas under the normal curve. Which of the following normal curves corresponds to P(34 < X<60)? O A. 34 50 60 O B. 34 50 60 ✔ O C. 34 50 60 N

Provide an appropriate response. 5) Find the area of the shaded region. The graph depicts IQ scores of adults, and those scores 5) are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 Assume that X has a normal distribution, and find the indicated probability. 6) The mean is µ = 137.0 and the standard deviation is a = 5.3. Find the probability that X is between 134.4 and 140.1. 6) 1 7) 7) The mean is µ = 60.0 and the standard deviation is o = 4.0. Find the probability that X is less than 53.0. 8) 8) The weekly salaries of teachers in one state are normally distributed with a mean of $490 and a standard deviation of $45. What is the probability that a randomly selected teacher earns more than $525 a week?

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Let the random variable X follow a normal distribution with u = 70 and o= 49. a. Find the probability that X is greater than 80. b. Find the probability that X is greater than 55 and less than 80. c. Find the probability that X is less than 75. d. The probability is 0.3 that X is greater than what number? e. The probability is 0.07 that X is in the symmetric interval about the mean between which two numbers? Click the icon to view the standard normal table of the cumulative distribution function. ... a. The probability that X is greater than 80 is (Round to four decimal places as needed.)

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Refer to the sample data for pre-employment drug screening shown below. If one of the subjects is randomly selected, what is the probability that the test result is a false positive? Who would suffer from a false positive result? Why? Positive test result Negative test result Drug Use Is Indicated Drug Use Is Not Indicated Subject Uses Drugs 39 14 Subject Is Not a Drug User 2 36 Pre-Employment Drug Screening Results The probability of a false positive test result is (Round to three decimal places as needed.)

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