After taking 9 tests, Carol's average grade in her Italian class is 90. Her teacher drops the lowest of
the 9 test scores to determine the final grade. If
Carol's final grade is 91, what was her lowest test
score?

82

Step-by-step explanation:

Given

Average in 9 tests = 90

Average when lowest score is removed = 91

Required

Find the lowest test score

Average or Mean is calculated as thus;

Where is the sum of test scores

n = number of tests

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When the smallest scores is removed; n = 9 - 1 = 8 and average = 91

becomes

Multiply both sides by 8

This means that Carol's test score in 8 subjects is 728

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Considering all 9 subjects

Let the 9th subject represent the subject Carol had the least score

n = 9

Average = 90

= 728 + the 9th subject

becomes

Multiply both sides by 9

Subtract 728 from both sides

Hence, Carol lowest test score was 82

1.0

step-by-step explanation: