Je suis un nombre entier compris entre 809 et 829. Je suis dovisible par 2 et 3, mais pas par 4 ni par 9. Qui suis-je?

Je suis 822.

Step-by-step explanation:

The required number must be divisible by 2,  so it will be even and  as it is also divisible by 3, the sum of its digits will be a number divisible by 3.

So the number could be one of the following:

810, 816, 822. 828.

810 is divisible by 9.

816 is divisible by 4.

822 is not divisible by 4 or 9.

828 is divisible by 4.

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step-by-step explanation:

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: