Listed below are the top 10 annual salaries of tv personalities. Find the range , variance and standard deviations for the sample data.
Given that these are the top 10 salaries, do we know anything about the variance in salaries of TV personalities?
42 40 39 31 22 18 15 12 11.7 10.5

range is 31.5, variance is 161.3 and standard deviation is 12.7 for a sample of top 10 annual TV personalities.

Step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

answer:

c) the x-coordinate of the center of the circle increases by 3