Can someone check this for me ? you!

Step-by-step explanation:

You've got the concept correct, but be careful with your parentheses.  You should write it 3/(2n).  Otherwise it looks like three halves n.

Yes.

Step-by-step explanation:

Yes, but I would write the equation as 3/ (2n) so that it is not understood as

'3/2 times n'.

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:

i need a diagram

step-by-step explanation:

no