04.05the mean shoe size of the students in a math class is 7.5.most of the shoe sizes fall within 1 standard deviation, orbetween a size 6 and a size 9.what is the standard deviation of the shoe size data for themath class? o 1.5o 27o 3.0o 3.8mark this and returnsave and exitnextஅபமார்

The formula of standard deviation is 

SD = square root of (variance)

Variance is the average of the squared differences from the Mean.

Variance = (6-7.5)^2 + (9-7.5)^2 / 2

Variance = 2.25

SD = square root (2.25)

SD = 1.5

The correct answer is A. 1.5

7 weeks

step-by-step explanation:

convert each fraction to the least common multiple of 20, so 3/4 = 15/20 & 1/10 = 2/20, then divide 15 by 2 and you get a little over 7, so the food will last 7 weeks.

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