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.

Given: ad¯¯¯¯¯ is an altitude. prove: ab2+ac2=cb2 right triangle a b c with right angle a. point d lies on side b c and segment a d is drawn. angle a d c is a right angle. drag and drop a reason into each box to correctly complete the two-column proof. statement reason ad¯¯¯¯¯ is an altitude, and ∠bac is a right angle. given ∠adb and ∠adc are right angles. definition of altitude ∠bac≅∠bda ? ∠bac≅∠adc ? ∠b≅∠b ? ∠c≅∠c reflexive property of congruence △abc∼△dba ? △abc∼△dac aa similarity postulate abbd=cbab ? ab2=(cb)(bd) cross multiply and simplify. acdc=cbac polygon similarity postulate ac2=(cb)(dc) cross multiply and simplify. ab2+ac2=ab2+(cb)(dc) addition property of equality ab2+ac2=(cb)(bd)+(cb)(dc) substitution property of equality ab2+ac2=(cb)(bd+dc) ? bd+dc=cb segment addition postulate ab2+ac2=cb2 substitution property of equality