Statistics: grouped data and cumulative frequency

Question 1 of 10

The class boundaries of 20–29 are

Question 2 of 10

Histogram bars have gaps between them.

Question 3 of 10

Find 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.

Question 4 of 10

The median of grouped data can be estimated from the ogive at

Question 5 of 10

Find the mean of the grouped data (class: frequency) 0–9: 2, 10–19: 11, 20–29: 3, 30–39: 3, 40–49: 5. Give the answer to 1 decimal place.

Question 6 of 10

Find the mean of the grouped data (class: frequency) 20–29: 3, 30–39: 2, 40–49: 2, 50–59: 7, 60–69: 10. Give the answer to 1 decimal place.

Question 7 of 10

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

Question 8 of 10

An ogive is drawn using cumulative frequencies.

Question 9 of 10

The total of the frequencies equals the last cumulative frequency.

Question 10 of 10

The marks of some candidates are grouped as (class: frequency) 1–10: 5, 11–20: 14, 21–30: 12, 31–40: 9, 41–50: 15, 51–60: 11. (a) Construct a cumulative frequency table. (b) Calculate the mean mark, correct to 1 decimal place. (c) Describe how you would estimate the median from an ogive.