Statistics: grouped data and cumulative frequency

Question 1 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 2 of 10

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

Question 3 of 10

Find the mean of the grouped data (class: frequency) 30–39: 4, 40–49: 6, 50–59: 6, 60–69: 8, 70–79: 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

A cumulative frequency curve is called an

Question 6 of 10

The median is always equal to the mean.

Question 7 of 10

Find the mean of the grouped data (class: frequency) 30–39: 7, 40–49: 3, 50–59: 6, 60–69: 2, 70–79: 5. Give the answer to 1 decimal place.

Question 8 of 10

The marks of some candidates are grouped as (class: frequency) 1–10: 14, 11–20: 4, 21–30: 12, 31–40: 4, 41–50: 6, 51–60: 4. (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.

Question 9 of 10

The class mark (mid-point) of the class 20–29 is

Question 10 of 10

The interquartile range is