On a field trip, there are three chaperones for every 20 students. there are 92 people on the trip. answer these questions.

a. how many chaperones are there?
b. how many children are there?

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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.