Need help finding the average on the trails i had did on range and velocity of projectile at ramp distance Ramp Incline 67 degrees

First Trial
Ramp distance 1.02
Trial measured distance (m)
1 1.10m
2 1.13m
3 1.15m
4 1.12m

What will be the average?

Ramp Incline 67 degrees

Second Trial
Ramp distance .90
Trial measured distance (m)
1 1.01m
2 1.04m
3 1.03m
4 1.03m

What will be the average?

Ramp Incline 67 degrees

Third Trial
Ramp distance .85
Trial measured distance (m)
1 .90m
2 .92m
3 .90m
4 .89m

What will be the average?

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Two identical 82 mg dust particles very far apart (pee 0) are moving directly toward each other at a speed of 3698 m/s. the charge on each is-719 ? c. determine how close they will get to each other. let k = 9x109 n-m2/c2 & ignore gravity.

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.