A Computer Store Has 75 Printers of Which 25 Are

question 69

Multiple Choice

A computer store has 75 printers of which 25 are laser printers and 50 are ink jet printers. If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.

• A) Mean = 6.7, Variance = 2.2
• B) Mean = 6.7, Variance = 1.5
• C) Mean = 3.3, Variance = 2.2
• D) Mean = 3.3, Variance = 1.5