The average number of kilos of meat climbed up to 300 pesos with a standard deviation of 50 pesos. Assume that the variable is normally distributed

Question

1.what is the probability that a public market selcted randomly will set their price ti more than 28opesos;(useP(×<325).

2.Find the probability that a public market selected randomly will set their price to less than 325pesos? (UseP(×<325).

3. If 50 markets are selected randomly,calculate the probability that the average price of the meat is greater than 290pesos?use P(×>290).

Answer 1

Assuming that what was really said was "The average price of a kilo of meat climbed to 300 pesos, with a standard deviation of 50 pesos. Assume the price is normally distributed. "

assuming 1st question was

1.what is the probability that a public market selected randomly will set their price ti more than 280 pesos;(useP(×>280). using TI-85 nmcdf(280,99e6,300,50) the answer is .6554

2.Find the probability that a public market selected randomly will set their price to less than 325 pesos? (UseP(×<325)). using TI-85 nmcdf(-99e6,325,300,50) the answer is .6915

3)If 50 markets are selected randomly,calculate the probability that the average price of the meat is greater than 290 pesos? use P(×>290). T test, t stat = (290-300)/√(2500/50). tcdf(-99e6,7.07,49) the answer is .0018