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[#permalink]
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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[#permalink]
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.


:lol: 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! :x

OA is E!
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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]
Is answer choice A.. a trap answer in this question?
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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]
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fozzzy wrote:
Is answer choice A.. a trap answer in this question?


I find nothing too tricky in the first statement.

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

(1) On the test, half of the class had grades below 70 and half of the class had grades above 70 --> {69, 71} answer YES but {69, 100} answer NO. Not sufficient.

(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.

Answer: 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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