2 Which fraction is equivalent to ? : O 3 2 2+1 3 7, because 6 6+1 7 Go 3 9 2 1 13 g 0 , be because à - 3 and 3 - 음 because - ; and 5- o ND 3 12 2 1 6. 3 1 3 312 o 3 2 1 2+1 g, because 6 2 6+2 3 8

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step-by-step explanation:

answer: need a picture

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.