f 4 adult females are randomly selected, find the probability that they have pulse rates with a mean less than 81 beats per minute.

The answer is 0.9726

Step-by-step explanation:

its 4 because 2 times 2 is 4, if you double the number two you get four

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%