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xz_007 [3.2K]
3 years ago
11

Karinas science test scores for this quarter are 84,86,90 and 68. What score does she need on her fifth science test to get a te

st average of at least 84
Mathematics
1 answer:
Ket [755]3 years ago
8 0

Answer:

Karina must score atleast 92 on the fifth test to get a average of atleast 84.

Step-by-step explanation:

We are given the following in the question:

84, 86, 90, 68

We want the average score to be atleast 84.

Let x be the score on fifth test.

Formula:

Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}

Thus, we can write the equation:

\dfrac{84+86+90+68+x}{5}\geq 84\\\\\Rightarrow 84+86+90+68+x \geq 420\\\Rightarrow 328+x \geq 420\\\Rightarrow x \geq 92

Thus, Karina must score atleast 92 on the fifth test to get a average of atleast 84.

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