The points scored on a test for a sample of
41

students are summarized in the following table.

number of students
score for each student
6

90

16

80

15

70

4

60

find the mean points scored. round your answer to the nearest tenth.

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882