Alex collects stamps. he wants to buy a superhero set for $3.88, a president set for $5.88, and a dinosaur set for $3.88. he has $15 to spend on stamps. which statement best describes whether an exact total or an approximate total should be calculated? a. alex must add the 3 amounts exactly so he will know if he has enough money to buy the stamps. b. alex can round the prices of the stamps to the nearest dollar and then add to estimate if he has enough money.

Arestaurant manager wanted to get a better understanding of the tips her employees earn, so she decided to record the number of patrons her restaurant receives over the course of a week, as well as how many of those patrons left tips of at least 15%. the data she collected is in the table below. day mon tue wed thu fri sat sun patrons 126 106 103 126 153 165 137 tippers 82 87 93 68 91 83 64 which day of the week has the lowest experimental probability of patrons tipping at least 15%? a. sunday b. saturday c. friday d. thursday