Peter sent a motorized toy boat 21 ft downstream in 3 min. Jason sent the boat back upstream to Peter in 7 min. How fast did the boat travel in still water? How fast was the current moving?

Step-by-step explanation:

Given that an investigator measuring various characteristics of a large group of athletes found that the correlation between the weight of an athlete and the amount of weight that athlete could lift was 0.60.

Correlation coefficient is the measure of association and a positive value implies that increase in one value causes increase in the other.

Hence out of the given options correct ones are

c) The more an athlete weights, on the average the more he weights.

d) The more an athlete can lift, on the average the more he weighs.

e) 60% of athlete's lifting ability can be attributed to his weight alone.