At the karate school, class a has 8 students with an average age of 6 years. class b has 12 students with an average age of 9 years. the classes combine for a group workout.

what is the average age of the combined classes?

enter your answer as a decimal in the box.

I took the test and the answer is 7.8

Good luck!

At the karate school, Class A has 8 students with an average age of 6 years. Class B has 12 students with an average age of 9 years. The classes combine for a group workout.

What is the average age of the combined classes?

Enter your answer as a decimal in the box.

7.8 years

Step-by-step explanation: I took the test and got it correct but I will do it below

8*6=48

12*9=108

48+108=156

156/20=7.8 Hope this helps!

hi! i think the answer is 1/2 : )

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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