10x+20y=90 and 30x+25y=180 represents the situation.
Step-by-step explanation:
Given,
Larry bought = 10 steaks and 20 chickens
Larry spent = $90
Tyrik bought = 30 steaks and 25 chickens
Tyrik spent = $180
Let,
x be the cost of one steak.
y be the cost of one chicken.
According to given statement;
10x+20y=90
30x+25y=180
10x+20y=90 and 30x+25y=180 represents the situation.
Keywords: linear equations, addition
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Answer:
68% of exam scores lie within one std. dev. of the mean
Step-by-step explanation:
Because the standard deviation is 100, one standard deviation above the mean comes out to 600. Likewise, one std. dev. below the mean comes out to 400. By the Empirical Rule, 68% of exam scores lie within one std. dev. of the mean.
Total number of possible outcomes = 36
Total number with sum 7 =5
{1, 6} {2, 5} {3, 4}, {5, 2}, {6, 1}
P(sum 7) = 5/36
Answer: 5/36
