Dylan has 765 cards in his baseball card collection. he sells 153 of the cards. what is the percent of decrease in the number of cards in the collection?

Negative 5 1/12 + negative 4 1/4 + 6 3/4

What is 1/3x5 on anuber line what does it look like on a number line

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.