Tallahas 2 red, 1 blue, and 4 green balls of the same size in a bag. Tolia pulls one ball out of the bag without looking What is the probability that Tolia will pull a red ball out of the bay!
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Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?

Solve the following system of equations express your answer as an ordered pair in the format (a, b) with no spaces between the numbers of symbols 5x+2y=22