The bar graph shows the number of books issued by a library on each day from Monday to Saturday of a week.
Which of the following statements is/are correct?
1. The average number of books issued per day over the six days is 55.
2. The number of books issued on Thursday is 20% less than the number issued on Tuesday.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Both 1 and 2
Each statement is tested by reading the bars: the average is the total divided by 6, and “percent less than” is taken on the value after “than”.
1. The average number of books issued per day over the six days is 55. — Correct. The total is \(45+60+42+48+70+65=330\), and \(\displaystyle \frac{330}{6}=\) 55.
2. The number of books issued on Thursday is 20% less than the number issued on Tuesday. — Correct. Tuesday 60, Thursday 48; the fall is \(60-48=12\), and \(\displaystyle \frac{12}{60}\times100=\) 20% of Tuesday’s figure.