Question

The grid shows the number of hours worked last week by $12$ students of various ages at after-school jobs. Which of the following is true, according to his grid?

• A. Half of the students worked more than $12$ hours each.
• B. One student worked exactly $15$ hours.
• C. One $1$ year old worked more than $11$ hours.
• D. Move $18$ year olds than $17$ year olds worked at least $13$ hours each.
• E. Most of the students were under $16$ years old.

Answer 1

The correct option is D Move $18$ year olds than $17$ year olds worked at least $13$ hours each.

Let Avergae $=A$

So, $A(age=18years)=\frac{13+14+16}{3}=14.33$

$B(age=17years)=\frac{9+11+12+13+14}{5}=11.80$

$A(age=16years)=\frac{8+10+11}{3}=9.66$

$A(age=15years)=\frac{9}{1}=9$

Then we can say that Move $18$ years old than $17$ years olds worked at $13$ hours each.