The grouped frequency table below shows the times taken for 70 students to solve a problem. Time
(t minutes)
0 3<<4
4<<5
5<156
6<158
Number
of students
24
12
16
10
09
8
Complete the frequency density table for this information.
Time
(t minutes)
0 3 4 5 6 Frequency
density
8
12
16

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Ashley spent half of her lunch money on a turkey sandwich. then she spent two-thirds of the money she had left on a bottle of juice and the rest of the money on a cookie. if the cookie cost $.75, how much lunch money did ashley have to start with?