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Jay's mean score for four quizzes is 99. ​ ​His scores for the first three quizzes are 88 , 55 , and 99. ​ ​What is Jay's score for the last quiz?

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Answer: 154

Step-by-step explanation:

The mean is calculated by adding up all the numbers and dividing by the number of observations added up.

The above can therefore be expressed as:

(88 + 55 + 99 + x) / 4 = 99

242 + x = 99 * 4

242 + x = 396

x = 396 - 242

x = 154

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