The mean on a statewide geography test was 74 with a standard deviation of 12. West County sampled the scores of some of its students and reported a mean of 79 with a margin of error of ±1.9. To the nearest whole number, how many students were in West County’s sample?

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

boxplot e is the answer

alright so i think for this one it would to draw it out. this may be hard for me to try and draw, but i will do my best on here:

        r

  /       |     \

notice how it forms 2 triangles inside one bigger triangle.

so if we know the angle spr is the same as psr that is saying the measure of angle p is the same as angle s. this means the big triangle psr is either isosceles or equilateral. in both cases, the triangle is perfectly symmetrical when split down the middle, which is in this case rq. because we know it is perfectly symmetrical on both sides, we know that the two triangles inside the bigger one are equal.