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Angelina_Jolie [31]
3 years ago
14

Ella’s test grades in her history class are 89, 94, 82, 84, and 98. What score must Ella make on her next test to have a mean te

st score of 90?
Mathematics
2 answers:
aksik [14]3 years ago
8 0
Mean is same as average

to find average
add up terms
divided that sum by the number of terms you have
example

mean of x,y,z
x+y+z
3 terms
(x+y+z)/3=mean



so
represent next test score as x
89+94+82+84+98+x
count how many terms ther are (6 terms)

mean is 90
(89+94+82+84+98+x)/6=90
add the like terms
(447+x)/6=90
multiply both sides by 6 to clear fraction
447+x=540
subtract 447 from both sides
x=93

she needs a score of 93 on next test
zheka24 [161]3 years ago
7 0

Answer:

The answer is 93 is needed on the next test

Step-by-step explanation:

also right on EDGEN.

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