“Normal” BMI is up to 25 kg/m 2 . A laboratory study is being conducted to determine energy expenditure for those who are overweight and/or obese. The researchers have enrolled only subjects with BMI...

“Normal” BMI is up to 25 kg/m². A laboratory study is being conducted to determine energy expenditure for those who are overweight and/or obese.  The researchers have enrolled only subjects with BMI above 25.0 and have quantified obesity as “units above normal”.  For example, a subject with BMI of 32.3 is recorded as 7.3 (i.e. 32.3 – 25.0 = 7.3). Using this scheme, the mean obesity was found to be 8.7 kg/m²and the standard deviation was 6.4 kg/m².  If we convert the obesity measure used in this study back into conventional BMI (i.e., add 25.0 units to each measurement), what will the standard deviation be?

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