Estimating areas. Consider the graph of the normal distribution in Figure 14, which illustrates the relative frequencies in a distribution of systolic blood pressures for a sample of female students. The distribution has a standard deviation of 14.

a. What is the mean of the distribution?

b. Estimate (using area) the percentage of students whose blood pressure is less than 100.

c. Estimate the percentage of students whose blood pressure is between 110 and 130.

d. Estimate the percentage of students whose blood pressure is greater than 130.

Transcribed Image Text:

55 70 85 100 115 130 145 160 175 Blood pressure