Answer to Question #82028 in Statistics and Probability for isaac

Question

The regulations of the board of health in a particular state specify that the fluoride level must not exceed 150 parts per million (ppm). The 25 measurements given here represent the fluoride levels for a sample of 25 days. Although fluoride levels are measured more than once per day, these data represent the early morning readings for the 25 days sampled.

75 86 84 85 97
94 84 83 83 89
88 77 76 76 82
72 105 94 94 83
81 97 93 93 79
a) Determine the range of the measurements.
b) Dividing the range by 7, the number of subintervals selected, and rounding, we have a class interval width of 5. Using 70.5 as the lower limit of the first interval, construct a frequency histogram and cumulative frequency curve.
c) Find the mean, median and standard deviation for the data set.
From the histogram constructed and also the measures of central tenency calculated, what can you conclude about the distribution of the data?

Answer 1

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