Kevin bought 2 pairs of jeans that were originally $40 per
pair but were each marked down by $15 and 3 t-shirts for
$12 each. he also used a coupon for $10 off his entire
purchase. which keys could be entered into the calculator
to determine the total amount he spent?

•2* 40 - 15+ 3 * 12 - 10

•* 25+ 3*2

•2 * 25 + 3 * 12 - 10

•2*40 – 12* 12 – 10

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.