above is multiplied by 7, what is the new mean? what is the new standard deviation?...

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above is multiplied by 7, what is the new mean? what is the new standard deviation? 7.) On a test, assume = 71 and o=2.43. a) If a student's test score is 76, find their z-score. b) If a student's test score is 67, find their z-score. c) If a student's z-score is -1.64, find their test score. above is multiplied by 7, what is the new mean? what is the new standard deviation? 7.) On a test, assume = 71 and o=2.43. a) If a student's test score is 76, find their z-score. b) If a student's test score is 67, find their z-score. c) If a student's z-score is -1.64, find their test score.