The mean weight of a group of boys is 170 lb, with a standard deviation of 20 lb. If the weights are normally distributed, what percent of the boys from the group weigh between 195 and 220 lb? Round your answer to one decimal place.
a. 39.4%
b. 49.4%
c. 88.8%
d. 10.0%
e. 11.2%
d. 10.0%
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Write a system of linear equations in three variables, and then use matrices to solve the system.Ron attends a cocktail party (with his graphing calculator in his pocket). He wants to limit his food intake to 103 g protein, 93 g fat, and 135 g carbohydrate. According to the health conscious hostess, the marinated mushroom caps have 3 g protein, 5 g fat, and 9 g carbohydrate; the spicy meatballs have 14 g protein, 7 g fat, and 15 g carbohydrate; and the deviled eggs have 13 g protein, 15 g fat, and 6 g carbohydrate. How many of each snack can he eat to obtain his goal?
A. 7 mushrooms; 4 meatballs; 2 eggs B. 2 mushrooms; 7 meatballs; 4 eggs C. 4 mushrooms; 2 meatballs; 7 eggs D. 8 mushrooms; 5 meatballs; 3 eggs
Find the sum Sn of the first n terms of the geometric sequence.3, 
, 
, 
, . . . ; n = 8
A. 
B. 
C. 
D. 
Find the slope-intercept form for the line satisfying the conditions.Parallel to y = -4x, passing through (5, 7)
A. y = -4x B. y - 7 = -4x - 5 C. y = -4x + 27 D. y = -4x - 27
Find the perimeter.
A. 41 ft B. 51 ft C. 105 ft D. 50 ft