What is the probability that the sample mean for a sample of size 31 will be more than 76

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?