The ages of participants in a bond pile are normally distributed, with a standard deviation of 10 years. 34% are 40-50 years old and 13.5% are 20 and 30 years old. If there were 160 participants in the bonspiel, how many were between the ages of 20 and 60??

853.3

step-by-step explanation:

v = 1/3 a^2h

step-by-step explanation:

if the height is 57.7cm and the height of the slant edge is 18.2cm, then the volume is 1/3 a^2h.

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.

b.

step-by-step explanation:

i just know