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by selango » Sun Sep 05, 2010 5:12 am
Mean=8.1 ounces

SD=0.3 ounce

within 1.5 SD of the mean (ie)

1.5 SD =1.5*0.3=0.45

within 1.5 SD of the means (ie) values bw mean-0.45 and mean+0.45

bw 7.65 and 8.55

Only 7.51 is not in this range.

So 11 values
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by sdotcruz » Wed Sep 08, 2010 5:16 am
I agree with selango's explanation and answer. I just wanted to caution you to read the question carefully. I came across one question that asked for 1 SD below the mean/ negative SD. I did not read carefully and arrived at the wrong answer.
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by Gurpinder » Wed Sep 08, 2010 7:28 am
sdotcruz wrote:I agree with selango's explanation and answer. I just wanted to caution you to read the question carefully. I came across one question that asked for 1 SD below the mean/ negative SD. I did not read carefully and arrived at the wrong answer.
You can't have a negative SD.
"Do not confuse motion and progress. A rocking horse keeps moving but does not make any progress."
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