A company provides portable walkie-talkies to construction crews. The purchasing manager receives a brochure advertising a new brand of battery with a lower price. The purchasing manager decides to install both batteries in 16 randomly selected radios and record the results for the lifetime of the batteries (in hours).

The old brand is installed in eight radios and the results for the lifetime of the new batteries (in hours):

45

52

56

55

51

57

48

52

The new brand is installed in eight radios and the results for the lifetime of the new batteries (in hours):

30

52

49

59

52

65

61

32

Round all answers to the nearest whole number

The mean of the OLD BRAND is hours.

The mean of the NEW BRAND is hours.