Raul received a score of 77 on a history test for which the class mean was 70 with a standard deviation of 6. he received a score of 79 on a biology test for which the class mean was 70 with standard deviation 4. on which test did he do better relative to the rest of the class?

He did better on biology test.

Step-by-step explanation:

For comparing the scores we need to find z-scores for both subjects,

We know that,

z-score or standard score for x is,

Where, is mean,

is standard deviation,

In history test,

Thus, the z-score would be,

In biology test,

,

Thus, the z-score would be,

∵

Hence, he did better on biology test.

1d

2b

3 false

4 d

5 3200sq,ft

80+60+y=180

then divide the difference between 60 and y and add it to 180

so x =180 +( (y-60)/2)

x equals 200

step-by-step explanation:

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