4-21. COLLEGE FUND
Five years ago, Gustavo's grandmother put some money in a college savings account for him on his birthday. The account
pays simple interest, and now, after five years, the account is worth $500. Gustavo predicts that if he does not deposit or
withdraw any money, then the account balance will be $1000 five years from now,
a. How do you think Gustavo made his prediction?
b. Do you agree with Gustavo's reasoning? Explain why or why not

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.