In a sample of 135 ball bearings, the average diameter was found to be 2.99mm with a standard deviation of 0.49. Give a point estimate for the population variance of the diameter of the ball bearings. Round your answer to two decimal places, if necessary.

-4, -2, 1, 4

step-by-step explanation:

domain = x values

range = y values

answer: (-8,4) are the coordinates of a

step-by-step explanation:

let the side of square abcd is x .

thus the area of square abcd is .

now, by the diagram area of triangle ead= 1/2 × ea × ad = 1/2 × ea × x

( because ad is the side of square)

and, according to the question,

the areas of square abcd and right ead are equal.

⇒

⇒ea=2x

thus, ea: ab=2: 1

therefore, point a divides line segment eb into the ratio 2: 1.

⇒ by sectional formula coordinates of a are,

=

=

=(-8, 4)

thus the coordinates of a are (-8,4)

i think the answer is b. i hope i !