The graph represents the distribution of the number of questions answered correctly on a 50-question math test.
What is the standard deviation of the data?
04
Math Test Scores
O 8
O 12
O 24
24
28
32
36
40
44
48
х
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answer: 12   they all have at least 28 days

step-by-step explanation: haha

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.

is the anwser b. (-13)?