For the following set of data, find the percentage of data within 2 population standard deviations of the mean to nearest percent 67,39,42,66,72,70,66,67

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour. what is the cyclist average rate for the round trip in miles per hour ?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Answer asap! show all work! find the number of complex roots, the possible number of real roots and the possible rational roots of the polynomial function. then, solve for all roots. x^3 + 2x^2 + 3x + 6 = 0