The sum of the measures of the angles of a triangle is 180 the sum of the measures of the second and third angles is nine times the measure of the first angle the third angle is 20 more than the second let XYZ represent the measures of the first second and third angles respectively find the measures of the three angles

the answer is c. 23/3

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b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: