Question

Hugo averages 78 words per minute on a typing test with a standard deviation of 10 words per minute. Suppose Hugo's words per minute on a typing test are normally distributed. Let X= the number of words per minute on a typing test. Then, X∼N(78,10). Suppose Hugo types 49 words per minute in a typing test on Wednesday. The z-score when x=49 is ________. This z-score tells you that x=49 is ________ standard deviations to the ________ (right/left) of the mean, ________. Correctly fill in the blanks in the statement above. Select the correct answer below: Suppose Hugo types 49 words per minute in a typing test on Wednesday. The z-score when x=49 is 2.231. This z-score tells you that x=49 is 2.231 standard deviations to the right of the mean, 78. Suppose Hugo types 49 words per minute in a typing test on Wednesday. The z-score when x=49 is −2.9. This z-score tells you that x=49 is 2.9 standard deviations to the left of the mean, 78. Suppose Hugo types 49 words per minute in a typing test on Wednesday. The z-score when x=49 is 2.9. This z-score tells you that x=49 is 2.9 standard deviations to the right of the mean, 78. Suppose Hugo types 49 words per minute in a typing test on Wednesday. The z-score when x=49 is −2.231. This z-score tells you that x=49 is 2.231 standard deviations to the left of the mean, 78.

Answer 1