#1 A test engineer wants to estimate the
mean gas mileage (in miles per gallon) for a
particular model of automobile. Eleven of
these are subjected to a road test, and the
gas mileage is computed for each car. A
dotplot of the 11 gas-mileage values is
roughly symmetrical and has no outliers. The
mean and standard deviation of these values
are 25.5 and 3.01, respectively. Assuming
that these 11 automobiles can be considered
a simple random sample of cars of this
model, what is the critical value for a 95%
confidence interval?

Asmall (but heavy) particle placed in a glass of water will follow a zigzag motion because the particle will bounce off of the water molecules it meets. this is called brownian motion. a physicist simulates this on a computer, by varying the distance a particle can travel (called the mean free length), on average, before it collides with a water molecule and assigning the change in motion to be one of 8 directions, each with a similar probability. by running the simulated particle (with the same mean free length) many times she determines that it should take 15 seconds, on average, for the particle to fall to the bottom, with a standard deviation of 1.5 seconds. next she lets a real particle fall through a glass of water and finds that it took 18 seconds. what does she conclude, and why?

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 4

Math i have no idea how to do a and b