Tina has two bags of counters, Bag A and Bag B. There are 5 red counters and 3 blue counters in bag A. There are 4 red counters and 5 blue counters in bag B. Tina takes out a random counter from each bag.
(a) Draw a probability tree to represent this information
(b) Work out the probability that Tina takes two blue counters.

Zoey made 5 1/2 cups of trail mix for a camping trip. she wants to divide the trail mix into 3/4 cup servings. a. ten people are going on the trip. can zoey make enough 3/4 cup servings so that each person gets one serving? b. what size would the servings need to be for everyone to have a serving?

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.

I’m really confused and need to learn this