50. Five auditors participated in an experiment. Each was asked to identify errors or "red flags" in the financial statementsofafictitiouscompany.Thetimethateach of the five took to do the audit and the number of "red flags" properly identified were recorded, with the following results:

Time (min) Red Flags

190 20

160 40

150 30

180 25

170 35

Compute the covariance.

51. AtestisconductedtoestablishwhetherthereisaconnectionbetweenRPMsandfuel efficiencyforanew engine designed to run on biofuel. The results of the test are shown in the table:

RPMs (in 100s) Miles per gallon

8 53

30 42

18 48

50 41

44 46

Computethe covariance."