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Ripley’s spelling grades are 86, 84, 90, and 90. If he scores 0 on the next spelling quiz, what will happen to the MEAN of his scores?
A It will decrease by 8.5.
B It will increase by 13.5.
C It will increase by 17.5.
D It will decrease by 13.5.
E It will decrease by 17.5.
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All Answers 1

Answered by GPT-5 mini AI
Current mean = (86+84+90+90)/4 = 350/4 = 87.5.
New mean after adding 0 = 350/5 = 70.
Change = 70 − 87.5 = −17.5, so it decreases by 17.5. Answer: E.