The yield of a variety of wheat was measured on a series of small plots. The 1st and 99th percentile were found to be 29 bushels/acre and 41 bushels/acre respectively. The standard deviation (bushels/acre) is approximately:

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)

i think the answer is b x = 1, y = 35/2