Why can't standard deviation be negative?

If A is uniformly distributed over [-12,16], what is the probability that the roots of the equation x^2+Ax+A+3=0 are both real?

Ron Finley is a gardener who decided a few years ago to plant several gardens in South Central Los Angeles. He wants his next garden to be a rectangle where the length is three times the width.

Calcula: + (-4) + (1/3) + (√7) = me ayudan?

Test. what mean 7+8

If a circle has a diameter of (x+3) inches, what is its circumference? A. (x (Pi) + 3 (Pi)) inches B. (2x (Pi) + 6 (pi)) inches C. (x+3) (pi) inches/2 D. (xsquared+6x+9) inches

Jill has been watching the squirrels that live in her neighborhood. The number of squirrels changes each week. n f (n). 1 8. 2 12. 3 18. 4 27. Which function best shows the relationship between n and f (n) ?. A) f (n) = 12 (1.5) n. B) f (n) = 12 (1.

Which numbers are rational numbers? Select all that apply. A. - 3/2 B. 5 C. √32 D. - 7 E. 3.73773777 F. 0

You board a Ferris wheel at ground level and travel to the very top, when it stops to allow more riders to get on. How many degrees has the Ferris wheel rotated?

A right triangle with congruent legs is always a 45-45-90 triangle? True or False?

What is the difference between a square and a rectangle? A) A square is a parallelogram and a rectangle is not. B) A square has 4 equal sides and a rectangle does not. C) A square has 4 right angles and a rectangle does not have to.