Question

Karla scored 75,
80 and 90 on her history quizzes.
what is the minimum score she needs on her next
quiz to have a mean of 85?

Please help me.​

Answer 1

Answer:

80 is the answer . and its correct.

Answer 2

Answer:

HEY FRIEND,

HERE IS THE ANSWER YOU ARE SEARCHING FOR,

$mean = \frac{sum \: of \: observations}{no. \: of \: observations} \\ let \: the \: last \: score \: be \: x \\ = > mean = \frac{75 + 80 + 9 0 + x}{4} \\ = > 85 = \frac{245 + x}{4} \\ = > 340 = 245 + x \\ = > x = 340 - 245 = 95$

HOPE IT HELPS YOU.

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