Overview
Question Progress
Homework Progress
24/
These are the times for 200 people
to get to work.
A 10% sample, stratified by time, is taken.
Complete the table.
Time, t, (mins)
No. of people
in the sample
Time, t, (mins) No. of people
0 0 < x < 10
10 < x < 30
22
10 < x < 30
30 < x < 40
77
30 < x < 40
40 < x < 50
40 < x < 50
63
50 < x < 100
31
50 < x < 100

Standard deviation of 19,29,21,22,23

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Which value of y will make the inequality y< -1 false?