Kathy is twice as old as mary. kathy is 2 yrs younger than jon. the sum of all three ages is 77. how old is kathy?

I think Kathy is 75 years old

Step-by-step explanation:

If kathy is twice as old as Mary, that makes Mary 37 and a half, as that times 2 is 75, and that's two years younger than Jon

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:

m∠a is 90°

m∠b is 40°