Hey guys! wanted to check to see if this is right! Ty!!

m=16

Step-by-step explanation:

-4 = m/8 - 2 1/2 - 0/4

-4 = m/8 - 5/2                 cancel out 0/4, turn 2 1/2 into an improper fraction

-4 = m/8 - 20/8              common denominator

-4 = m - 20                    as the denominators are the same, we don't need them

16 = m                          add 20 to both sides to get the final answer

you a real one for tat answer

step-by-step explanation:

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.