Josette found 16 coins in her purse. She had 2 more nickels than pennies and 7 fewer quarters than pennies. Josette modeled the
scenario in a table and then wrote the equation p + (p + 2) + (7 – p) = 16.
Is Josette’s equation correct? If not, what was her mistake.
A): Her equation is correct.
B): The variable should have been the number of nickels.
C): Instead of finding the sum, she needed to write an equation to find the difference.
D): The number of quarters was translated incorrectly and should be p – 7.
Is Josette’s equation correct? If not, what was her mistake.
A): Her equation is correct.
B): The variable should have been the number of nickels.
C): Instead of finding the sum, she needed to write an equation to find the difference.
D): The number of quarters was translated incorrectly and should be p – 7.
2 answers:
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P(defective) = 3/12 = 1/4
P(good) = 1 - 1/4 = 3/4
The probability that at least 2 units are good is given by:
P(2 good) + P(3 good) + P(4 good) = 0.211 + 0.422 + 0.316 = 0.949.
P(good) = 1 - 1/4 = 3/4
The probability that at least 2 units are good is given by:
P(2 good) + P(3 good) + P(4 good) = 0.211 + 0.422 + 0.316 = 0.949.