Identify the class width class midpoints and class boundarie

Identify the class width, class midpoints, and class boundaries for the given frequency distribution.

Daily low temp (F) Frequency

40-44 1

45-49 3

50-54 5

55-59 11

60-64 7

65-69 7

70-74 1

Solution

Class Boundaries:       Class Width                      Class Mid Point

Lower Upper                 (Upper-Lower)                 (Lower+Upper)/2

39.5   -    44.5                     5                                        42

44.5    - 49.5                      5                                        47

49.5    -   54.5                      5                                        52

54.5     -   59.5                     5                                         57

59.5     - 64.5                     5                                          62

64.5     -   69.5                      5                                         67

69.5    -     74.5                     5                                          72