The following two-way table shows the data for the students of two different grades in a school: Member of School Band Not Member of School Band Total Grade 7 10 8 18 Grade 8 10 2 12 Total 20 10 30 Based on the relative row frequency, the students of which grade are more likely to be members of the school band?

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Anyone know? will mark brainliest if you're correct!

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.