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Pre - Mid Term Class X Aug, 2020.pdf
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there sum is 78?
(a) 11
(b) (c) 13
4. Distance between Al 2,3 ) and B( 4,1 ) is
(d) 14
(a) V2
(b) 2V2
(c) 3V2
(d) 3V2
5. Find the coordinates of the mid – point of a line segme
and
(-4,2).
(b) (-2,-2)
(c) (1,1)

means if you're already damaged some way when you take out a medical insurance you will not get full compensation for that injury that you already have.

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x

might be the correct answer will be question number 2

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.