Alibrarian recorded the number of books that were checked out on each of the last 9 days, as shown below. 142, 136, 125, 148, 150, 152, 115, 131, 136 what is the mean of the data set? a 137.22 b 1, 235 c none of these d 9

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.