Complete the chart to find the mean, variance and standard deviation. remember to use commas and round numbers to the nearest tenth. x _ x _ x - x _ (x - x)2 1. 900 = 466.2 = the mean is 2. 35 = -398.8 = 159,041.4 the median is 3. 500 = 66.2 = the variance is 99,667.2 4. 300 = -133.8 = the standard deviation is σ x = _ x = _ σ (x - x)2 = 398,668.6 n =

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!