Question

The ages of undergraduate students in a state

Answer 1

The percent of students that are aged 19 years or more is determined as 84%.

One standard deviation below the mean

In a normal distribution curve 1 standard deviation below the mean is defined as follows;

• 1 std below mean : M - d = 16%

M - d = 20.6 yrs - 1.3 yrs = 19.3 years ≈ 19 years

19 years or more will occur at (M - d) + (M) + (M + 2d) = 100% - (M - d)

                                                                                       = 100% - 16%

                                                                                       = 84%

Thus, the percent of students that are aged 19 years or more is determined as 84%.

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