Apopulation of n scores has a mean 15. one score in the population is changed from x 8 to x 28. what is the value for the new population mean?

Umm.. just started this 2day and its not on my notes(p′︵‵。)

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.

Y= a(x-3)squared-1 what is the value of a