jamie has taken three math tests. her scores were 85, 90, and 89. to get an average of 90 what must be the sum of all her tests
? what score does she need on the fourth test so that her mean score is 90 ?
1 answer:
Answer:
96 marks
Step-by-step explanation:
We know that the mean of a given amount of values is the sum of the values divided by the number of values
Let the marks in the fourth test = x marks
Mean of the values = 90
(85 + 90 + 89 + x) / 4 = 90
264 + x = 360
x = 96
Therefore, Jamie needs 96 marks in her 4th test to get a mean score of 90
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