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70 - Arithmetic Mean

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70 - Arithmetic Mean

by harsh.champ » Wed Feb 17, 2010 5:27 am
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.
(2) The lowest grade on the test was 45 and the highest grade on the test was 95.
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by ajith » Wed Feb 17, 2010 6:24 am
harsh.champ wrote: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.
(2) The lowest grade on the test was 45 and the highest grade on the test was 95.
1) is not sufficient to conclude AM is 70

2) is also not sufficient to to tell whether the AM is 70

Combining also not sufficient, E
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by shashank.ism » Sun Feb 21, 2010 2:42 pm
harsh.champ wrote: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.
(2) The lowest grade on the test was 45 and the highest grade on the test was 95.
St.1) half of the class had grades below 70 and half of the class had grades above 70. this doesn't mean it will give average of 70 ....not suff.
St.2) lowest and highest are 45 and 95 respectively ...This also don't shows that avg =70 ===insuff.

if we combine both then also we can't say that avg. = 70
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