Use the normal distribution to the right to answer the questions.
(a) What percent of the scores are less than 19?
(b) Out of 1500 randomly selected scores, about how many would be expected to be greater than 21?
Standardized Test Composite Scores
19
21
Score
mu equals 19.5sigma equals 5.3mu
x

A graph titled "Standardized Test Composite Scores" has a horizontal x-axis labeled "Score" from about 1 to 38 with tick marks at 19 and 21. A normal curve labeled μ = 19.5 σ = 5.3 is centered above the x-axis at 19.5. A vertical line segment labeled μ extends from the normal curve to the x-axis at 19.5.
(a) The percent of scores that are less than 19 is
nothing%.
(Round to two decimal places as needed.)
Enter your answer in the answer box and then click Check Answer.

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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step-by-step explanation:

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice