Which polynomial represents the difference below?
(5х^7+9х^4+ 3) - (x^4- 3х)
А. 5х^7 + 9x^4 + 3x + 3
в. 4x^11 + 8х^3 + 3
с. 8х+6
D. 4х^7+ 8x^4 - 3x+3

the reporter's right

step-by-step explanation:

1/4 = .25 / 25%

where is the option given

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.