If m = 21 and n=3, what is the value of the following expression?
m-4.
+3
OA. 54
OB. 12
OC. 6
OD. 51

17

Step-by-step explanation:

21 - 4 = 17

Substitute values

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:

16.80 times .20= 3.36

step-by-step explanation: