7. Two mark exercise problems II

1. In a class test in mathematics, $10$ students scored $75$ marks, $12$ students scored $60$ marks, $8$ students scored $40$ marks and $3$ students scored $30$ marks. Find the mean of their score.

 

Answer:

 

Mean $=$

 

(Note: Round off the answer to a whole number.)

 

2. In a research laboratory scientists treated $6$ mice with lung cancer using natural medicine. Ten days later, they measured the volume of the tumor in each mouse and given the results in the table.

 

 

Find the mean.

 

Answer:

 

Mean $=$ $mm^3$

 

(Note: Round off the answer to $1$ decimal place.)