Core Mathematics

1Histogram bars have gaps between them.

2The class mark of the class 70–79 is ___.

3The class mark of the class 50–59 is ___.

4The class mark of the class 80–89 is ___.

5In a histogram, the bars

6State the modal class of the data (class: frequency) 0–9: 8, 10–19: 10, 20–29: 4, 30–39: 5, 40–49: 11.

7Find the mean of the grouped data (class: frequency) 0–9: 7, 10–19: 5, 20–29: 4, 30–39: 10, 40–49: 12. Give the answer to 1 decimal place.

8The total of the frequencies equals the last cumulative frequency.

9State the modal class of the data (class: frequency) 10–19: 5, 20–29: 10, 30–39: 8, 40–49: 12, 50–59: 4.

10The median is always equal to the mean.