The following data represent glucose blood levels

The following data represent glucose blood levels(mg/100 ml) after a 12 hour fast for a random sample of 70 women. Use six classes and determine the class width. (Enter the number only. Do not include any other text.)

45, 66, 83, 71, 76, 64, 59, 59

76, 82, 80, 81, 85, 77, 82, 90

87, 72, 79, 69, 83, 71, 87, 69

81, 76, 96, 83, 67, 94, 101, 94

89, 94, 73, 99, 93, 85, 83, 80

78, 80, 85, 83, 84, 74, 81, 70

65, 89, 70, 80, 84, 77, 65, 46

80, 70, 75, 45, 101, 71, 109, 73

73, 80, 72, 81, 63, 74