PISA is an international survey conducted every three years among school students in a number of countries. The survey in 2009 included 4,700 students from Norway. In the natural sciences, the Norwegian students scored an average of 500 points. It was exactly like the international average. The standard deviation for Norwegian pupils was 80 points. We randomly pull out a student among the Norwegian participants. You can expect the student's score to be normally distributed.

a) Determine the probability that the student scored at least 650 points.
b) Determine the probability that the student scored between 475 and 535 points.

c.

step-by-step explanation:

you need to show the graph

step-by-step explanation:

intensity of the vector is v= √37 ≈ 6.08 units and make angle ∡α ≈ 9.46° with east direction

step-by-step explanation:

required vector is consists of the two componentsvx= 2+4=6 units   and vy= 1 unit and vx ⊥ vywe will use pythagorian theorem to find intensity of the vector vv∧2 = vx∧2 + vy∧2 => v = √vx∧2 + vy∧2 = √6∧2 + 1∧2 = √36+1 = √37 ≈ 6.08 unitsthe angle ∡α between vector and east direction we wil find with tanαtanα = 1/6 => α = arc tanα = arc 1/6 => α ≈ 9.46°

hope this

answer: 1,380

step-by-step explanation:

1: you turn %15 into a decimal by moving the decimal point two places to the left.

2: and then you multiply .15 by 1,200 , which will get you 180.00

3: from there you will add 180 to 1,200

4: which will get you 1,380

hope it *im kind of slow so idk if my answer is right*