I keep gettin this wrong . Please help

  20, 21, 22

Step-by-step explanation:

The sum of the first and third is twice the middle one. So, if that is the middle one plus 21, the middle one must be 21.

The integers re 20, 21, 22.

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  20 +22 = 42 = 21 +21

765238725478629038640962136509762139056074

step-by-step explanation:

64087235609746097215074621039754021037

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: