Presley has 6 books. there is enough space on a shelf for 4 books. in how many ways can 4 of the 6 books be arranged on the shelf?

Standard deviation of 19,29,21,22,23

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%

Aconstruction worker has rope 9 m long he needs to cut it in pieces that are each 3 /5 m long how many such pieces can he cut without having any rope leftover?