A principal receives reports from teachers via email. The probability model describes the number of emails the principal may receive in a day. Emails Received
0
1
2
3
4
5

P(X)
0.05
0.15
0.35
0.25
0.15
0.05

How many emails would you expect the principal to receive each day?
3.9
3.65
3.25
2.9
2.45

When drawing a trend line for a series of data on a scatter plot, which of the following is true? a. there should be an equal number of data points on either side of the trend line. b. all the data points should lie on one side of the trend line. c. the trend line should not intersect any data point on the plot. d. the trend line must connect each data point on the plot.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

Math question.. plz me .. best answer all