average = 89%
average = (94% + 84%)/2 = 89%
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The average of 82 percent, 94 percent, 89 percent, and 91 percent is 89 percent.
Simi's tests so far can be expressed as 320 percent divided by four. To average 84 percent, she would need five times 84 or 420 percent. The difference is 100%. Assuming all the tests are equally weighted, she needs 100% on the 5th test.
84 percent of 100 is 84.
50 percent of 84 = .50 x 84 = 42
84 percent as a decimal = 0.8484% = 84%/100% = 0.84