Homework Help: statistics

Posted by Darcy on Monday, September 12, 2011 at 8:23pm.

It appears to people who are mildly obese are less active than leaner people. One study looked at the average number of minutes per day that people spend standing or walking. Among mildly obese people, minutes of activity varied according to the N(373,67) distribution. Minutes of activity for lean people had the N(526,107) distribution. Within what limits do the active minutes for 95% of the people in each group fall? Use the 68-95-99.7 rule.

I have no idea where to even begin to try and answer this. I am so lost. Please help!! Thanks!

statistics - MathGuru, Tuesday, September 13, 2011 at 7:38pm
About 95% of a normal distribution lies within 2 standard deviations of the mean.

N(373,67) means the distribution is a normal distribution with mean = 373 and the variance = 67 (standard deviation = square root of 67).

N(526,107) means the distribution is a normal distribution with mean = 526 and the variance = 107 (standard deviation = square root of 107).

Determine the limits by using the mean and standard deviation. Remember to determine 2 standard deviations below the mean and 2 standard deviations above the mean for your limits.

I'll let you take it from here.
statistics - Pedro, Sunday, February 17, 2013 at 10:03pm
N(373,67) means the distribution is a normal distribution with mean = 373 and the variance = 67 (standard deviation = square root of 67).

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