At a large university, data were collected on the number of sisters and brothers that each student had. let the random variable x x represent the number of sisters and the random variable y y represent the number of brothers. the distribution of x x has mean 1.00 and standard deviation 0.94. the distribution of y y has mean 1.07 and standard deviation 1.04. what is the mean of the distribution of x

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

step-by-step explanation:

1. sometimes

2. never true

3. sometimes

step-by-step explanation:

these are pretty self explanatory if you know what supp right and com angles are