Question

In which class interval number of ducks is equal to $20$ ponds?

• A. $0-19$ and $80-99$
• B. $19-39$ and $80-99$
• C. $20-39$ and $80-99$
• D. $40-59$ and $100-119$

Answer 1

The correct option is C $20-39$ and $80-99$

From the histogram, the class width of number of ducks:

$0-19=30$ number of ponds.

$20-39=20$ number of ponds.

$40-59=25$ number of ponds.

$60-79=10$ number of ponds.

$80-99=20$ number of ponds.

$100-119=15$ number of ponds.

Therefore, $20-39$ and $80-99$ is the two class interval equal to $20$ ponds.

Hence, option $C$ is correct.