A math test has 10 multiple-choice questions, each with 3 answers to choose from. If a person taking this test were to
guess on every question, what is the probability that they
will receive a grade of 70 or above?
A. 4.286%
B. 1.967
C. 2.057
D. 1.626

answer: your correct answer is b. d.

step-by-step explanation:

the answer is:

mean: 6

mad: 2.14

55.44 inches

step-by-step explanation:

part a. assuming a perfectly linear relationship, we can find the slope from the first two data points.

slope = m = (change in rainfall)/(change in years)

= (61.80 -62.33)/(2005 -2004) = -0.53/1 = -0.53

then the point-slope form of the equation of the line can be written as

y = m(x -h) +k . . . . . m = -0.53, (h, k) = (0, 62.33)

y = -0.53x +62.33 . . . x = years after 2004

part b. in 2017, x = 2017 -2004 = 13. then the predicted rainfall is

y = -0.53·13 +62.33 = 55.44 . . inches

the predicted rainfall in 2017 is 55.44 in.

the value of x is 28.2