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# Was 70 the average (arithmetic mean) grade on a class test?

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Click E --> Click Next --> Click Confirm

There is no way, to find out the average of the information given.

1 & 2 together... could be 50 times grade 45 and then 49 times grade 71 and one time grade 95...... or there could be another distribution, which has an effect on the average.
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nero44 wrote:
Click E --> Click Next --> Click Confirm

There is no way, to find out the average of the information given.

1 & 2 together... could be 50 times grade 45 and then 49 times grade 71 and one time grade 95...... or there could be another distribution, which has an effect on the average.

Agree! I posted this coz I was calculating the average using B by assuming (for some strange reason) that all the scores inbetween would be evenly placed!

OA is E!
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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]
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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]
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fozzzy wrote:

I find nothing too tricky in the first statement.

Was 70 the average (arithmetic mean) grade on a class test?

(2) The lowest grade on the test was 45 and the highest grade on the test was 95 --> {45, 95} answer YES but {45, 69, 95} answer NO. Not sufficient.

(1)+(2) {45, 95} answer YES but {45, 69, 95, 95} answer NO. Not sufficient.

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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]
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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]
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