Mathematics, 09.11.2019 02:31, quetzaliescalona
Minted coins: in the us, the year each coin was minted is printed on the coin. to find the age of a coin, simply subtract the current year from the year printed on the coin. the ages of circulating pennies are right skewed. most circulating pennies were minted relatively recently, and extremely old pennies are rare. assume the ages of circulating pennies have a mean of 12.2 years and a standard deviation of 9.9 years. a) based on the information given, can we determine the probability that a randomly selected penny is over 10 years old? b) what is the probability that a random sample of 40 circulating pennies has a mean less than 10 years? c) what is the probability that a random sample of 40 circulating pennies has a mean greater than 10 years? d) what is the probability that a random sample of 40 circulating pennies has a mean greater than 15 years? e) would this be unusual? explain your answer.
Answers: 3
Mathematics, 21.06.2019 20:30, cld3331
Merrida uses a pattern in the multiplication table below to find ratios that are equivalent to 7: 9. if merrida multiplies the first term, 7, by a factor of 6, what should she do to find the other term for the equivalent ratio? multiply 9 by 1. multiply 9 by 6. multiply 9 by 7. multiply 9 by 9.
Answers: 1
Mathematics, 21.06.2019 22:00, krandall232
Match the scale and the actual area to the area of the corresponding scale drawing. scale: 1 inch to 4 feet actual area: 128 square feet scale: 1 inch to 7 feet actual area: 147 square feet scale: 1 inch to 8 feet actual area: 256 square feet scale: 1 inch to 5 feet actual area: 225 square feet area of scale drawing scale and actual area scale drawing area: 3 square inches arrowright scale drawing area: 8 square inches arrowright scale drawing area: 4 square inches arrowright scale drawing area: 9 square inches arrowright
Answers: 2
Minted coins: in the us, the year each coin was minted is printed on the coin. to find the age of a...
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