What is the measure of angle A? And what is the length of AB?

∠A=53, and AB=13.7734922397

Step-by-step explanation:

Angles in a triangle add up to 180.

∠A+∠B+∠C=180

∠A+37+90=180

∠A=53

Use sine rule:

x/sinX=y/sinY

AB/sin∠C = CB/sin∠A

AB/sin90 = 11/sin53

AB/1=11/0.79863551004

AB=13.7734922397

hello,

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: