Help me out if you can

1. Find the sample standard deviation of the following sample 10 12 11 13 11 10 2. You have a box of marbles. There are 10 green, 12 red, 6 blue, 8 yellow, and 14 purple. You draw three marbles in a row (without replacing) What is the probability of drawing blue then red then yellow (in that order) in other words what is P(Blue and Red and Yellow) 3. The probability of catching a salmon in less than an hour on the Snake River is .83, if a group of 20 fishermen went fishing, what is the probability that exactly 18 of them would catch a salmon in less than an hour? 4. The average time for a manufacturer to create a machine through an assembly process is 16.2 hours (normally distributed) with a standard deviation () of 1.4 hours. A new process is introduced to reduce the time of assembly. A random sample of 40 machines shows the average to be 15.8 hours. Has the process significantly reduced the time of production? Perform a hypothesis test (a = .01) to show if u