1. ## Help

Steven’s scores on Algebra tests are 91, 89, 86, and 93. What is the minimum score Steven can receive on the fifth test so that the average (mean) of the five tests will be 90 or higher?
a. 88
b. 89
c. 90
d. 91

2. ## Re: Help

Originally Posted by catherinee
Steven’s scores on Algebra tests are 91, 89, 86, and 93. What is the minimum score Steven can receive on the fifth test so that the average (mean) of the five tests will be 90 or higher?
a. 88
b. 89
c. 90
d. 91
the average is going to be

$$\frac{1}{5}\left(91+89+86+93+T\right)$$

where T is the score on the 5th test.

so solve

$$\frac{1}{5}\left(91+89+86+93+T\right) \geq 90$$

for T. Can you do that?

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