A student takes a 20-question true/false exam and guesses on each question. Find the probability of passing if the lowest passing grade is 15 correct out of 20. Give your answer as a decimal rounded to 4 decimal places.

Can you decompose the numbers 20,740,6,000

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

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.