Find the mean of given data set: 2, 5, 5, 6, 7, 1, 2

would be the mean.

Step-by-step explanation:

The mean is when you add up the numbers and divide it by how many numbers there are.

There are 7 numbers. Divide it.

:)

The mean is 4.

Step-by-step explanation:

Mean simply means average. To do so, just add up all the numbers and divide by the amount of numbers present.

2 + 5 + 5 + 6 + 7 + 1 + 2 = 28/7 = 4

irst, find the z score of a score of 80. this is given by the formula z = (x-u)/o, where x is the score, u is the mean, and o is the standard deviation. this gives

z = (80-78)/12 = 1/6 = .1667

now, find what percentile a z score of 1/6 correlates to in the normal distribution.

a z score of 1/6 = .1667 is equivalent to the 56.36th percentile of the distribution. so the probability a score is over this is 1-.5636 = .4364

the mean of a sample mean is equal to the original mean. however, the standard deviation of a sample mean is equal to the original standard deviation divided by the square root of n (sample size). so the new standard deviation is 12/sqrt(16) = 3.

the new z score is 80-78/3 = 2/3 = .667. this is equivalent to the 74.86th percentile. so the probability that the mean will be greater than this score is 1-.7486 = .2514.