Question

A teacher listed 28,30,32 and 36 as ages of students in his class with frequencies 8,10,5 and 7 respectively A,what is the average age of the students?​

Answer 1

//Make a box of 3 rows//

//change x bar and summation into sign; I don’t have the sign in my keyboard//

Age of Frequency(f) fx
students(x)
28 8 224
30 10 300
32 5 160
36 7 252
Total= N=30 Summationfx
=936

Now,
Mean(x bar)= summationfx
—————————
N
=936
———
30
=31.2

Hence, the average age of the students is 31.2 years

Answer 2

Answer

Step-by-step explanation:

first 28*8+30*10+32*5+36*7/(over) total

total=30

28*8=224

30*10=300

32*5=160

36*7=252

then add

936/30=31.2