For margin of error to be a maximum of 3:
3 = z*(SD / sqrt(n)), where z is the z-score, SD is the standard deviation and n is the sample size.
z = 1.96 for a 95% confidence interval, and we are given SD = 15.
3 = 1.96*15/sqrt(n)
sqrt(n) = 9.8
n = 96.04 ~ 96 commercials.
Answer:
C. Sample: All names are written on pieces of paper and dropped into a container. Three hundred names are drawn.
Step-by-step explanation:
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Answer:
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Answer:- The composition of translation is :
Translation: (x,y)→(x-2,y+2) [as the given piece moved 2 steps to the left and 2 steps upwards]
Translation:(x,y)→(x+2,y+2) [as the given piece moved 2 steps to the right and 2 steps upwards]
A single translation that moves the piece from its original position to its ending position is [ignoring the diagonal movement]
Translation:-(x,y)→(x,y-4)[as piece have to go 4 steps downwards]
There are 21 people, everyone hugs each other, but the person hugging cant hug themself, so (21*21)-21
(21*21) -21 = 441
441-21=420