The national mean sat score in math is 550. suppose a high school principal claims that the mean sat score in math at his school is better than the national mean score. a random sample of 72 students finds a mean score of 574. assume that the population standard deviation is latex: \sigma=100 σ = 100 . is the principal's claim valid? use a level of significance of latex: \sigma=0.05 σ = 0.05 .

13875138answer:

step-by-step explanation:

use a calculator!

i dont know it

step-by-step explanation:

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

r(0,90)(x,y) . t(-5,0)

last option

step-by-step explanation:

∆def to ∆d"e"f"

- rotate 90 counterclockwise degrees

- then translated 5 to the left (x --> x - 5)

answer is the last option