21. On Friday, the temperature at 8:00a. m. was 49°F and rose at a constant rate of OF per hour until noon. A
cold front passed through at noon, and the temperature
then fell at a constant rate of 1°F per hour. The
temperature first fell below 49°F between:
A. noon and 1 p. m.
B. I p. m. and 2 p. m.
C 2 p. m. and 3 p. m.
D. 3 p. m. and 4 p. m.
E. 4 p. m. and 5 p. m.
22. Letter grades in Hugo's math class are based on the
norcent of the total possible points on 4 unit exams

The probability of winning something on a single play at a slot machine is 0.11. after 4 plays on the slot machine, what is the probability of winning at least once

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.