Question

Heavy football players: Following are the weights, in pounds, for samples of offensive and defensive linemen on a professional football team at the beginning of a recent year. 

(a) Find the sample standard deviation for the weights for the offensive linemen. Round the answer to at least one decimal place

(b) Find the sample standard deviation for the weights for the defensive linemen. Round the answer to at least one decimal place

Answer 1

S.d for weights for offence is 35.6 lbs

S.D for weights for defense is 33.5 lbs

Answer 2

The random variable X represents the number of calls per hour to a call center in the last month. The probability distribution for X is below. 

X	0	1	2	3	4	5	6	7
P(x)	0.01	0.10	0.26	0.33	0.18	0.06	?	0.03

a) Find the probability of getting exactly 4 calls per hour last month.

b) Calculated the expected number of calls in the last month. Interpret.