Suppose a simple random sample of size nequals49 is obtained from a population with mu equals 78 and sigma equals 7. ​(a) Describe the sampling distribution of x.
​(b) What is P (x > 79.7)?
(c) What is P (× < 75.75)?
(d) What is P (76.95 < x < 80)?

a. the residual plot for model 1 has a random pattern and is a good fit for the data.

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0

13cm

step-by-step explanation:

(apex)

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4