During the formation of the aurora borealis, the electrons in an atom experience a change in energy levels. Which statement about this change is accurate? First, the electron releases energy to move to a higher energy level.

First, the electron absorbs energy to move to a higher energy level.

First, the electron absorbs energy to move to a lower energy level.

First, the electron releases energy to move to a lower energy level.

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.

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).