If an investor purchased 50 shares of IBM stock at $85 per share, 90 shares at$105 per share,120 shares at $110 per share, and another 75 shares at$130 per share, what is the mean cost per share?

2. Originally Posted by neverlosehope
If an investor purchased 50 shares of IBM stock at $85 per share, 90 shares at$105 per share,120 shares at $110 per share, and another 75 shares at$130 per share, what is the mean cost per share?
$\\ \frac{5 \times 85+90 \times 105+120\times 110+75\times 130}{5+90+120+75}$

3. ## plz help me

Mother’s age The following data give the number of births in the United States in the year 2000 by the age of the mother .the numbers of the children are given in thousands.

Age of mother
10-14
15-19
20-24
25-29
30-34
35-39
40-44
45-49

No. of birth
9
469
1018
1088
929
452
90
4

(a)Find the mean age of a women who became a mother in 2000.
(b) Find the median age of a woman who became a mother in 2000.