Two of Ms. Cole's Earth science classes have 23 students each. Box plots for recent test scores for these two classes are displayed.
Third Period
+++
45 50 55 60 65 70 75 80 85 90 95 100
Fifth Period
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45 50 55 60 65 70 75 80 85 90 95 100
Which statement about the scores is true?
A. The means of the two sets of data are equal.
B. The lower quartiles of the two sets of data are the same.
c. More students in third period than in fifth period scored an 87 or above.
D. Fewer students in third period than in fifth period scored a 70 or below.

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.

The data set represents the ages of players in a chess club. 27, 34, 38, 16, 22, 45, 54, 60. what is the mean absolute deviation of the data set?

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)