A sample offifth-grade classes was studied in an article. One of the variables collected was the class size in terms ofstudent-to-faculty ratio. Thestudent-to-faculty ratios of the 75 fifth-grade classes sampled have a mean of 17.94 and a standard deviation of 2.38. Complete parts(a) through(d) below.

a. Construct the graph shown below.

x

x3s

x2s

xs

x

x+s

x+2s

x+3s

A horizontal x-axis has 7 equally spaced tick marks with the following labels, from left to right: x bar - 3 s, x bar - 2 s, x bar - s, x bar, x bar + s, x bar + 2 s, x bar + 3 s.

x3s

=

nothing

x+s

=

nothing

x2s

=

nothing

x+2s

=

nothing

xs

=

nothing

x+3s

=

nothing