A. (2 + 2) × (3+2) = b. (9 -47) (10 + 2) =

c. (11 - 3) (7 - 4) =

d. (x + 4) (x + 3) =

e. (x - 5) (x – 4) =

f. (x - 4) (x + 7) =

g. (2x – 3y) - 2 (3x + y)

h. (2p – q) × (3p + 2q)

i. (4x – 2y) +3 (5x + 3y)

j. 2 (3a –b) (2a -4b)

k. (2a +b)2

l. (2x – 3y)2

m. (3+4) (4+2)

n. (2a –c) (3a + 4c)

o. (4x – 2y) - 3 (5x + 3y)

p. 2(2x + 1)

q. x(-2x – 1)

r. -2(-x + 1)

s. 4(x + 1)

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.