Daily Practice · Foundation
March 1999 5-a-day
Printing for a group?
The batch download puts all 2 tiers' March 1999 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in March 1999
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st March 1999Explain why a crude rate is more useful than a raw total, such as the total number of deaths, when comparing two towns of different sizes.
- 2nd March 1999A factory has 400 workers: 160 in production, 120 in packing and 120 in admin. A stratified sample of 50 workers is needed. Find how many should be sampled from packing.
- 3rd March 1999Using the same table (0:4, 1:10, 2:4, 3:2), find the mean number of siblings.
- 4th March 1999The mean rainfall in April was 45 mm with a range of 20 mm; in May it was 45 mm with a range of 8 mm. Compare April and May.
- 5th March 1999A cost index for electricity, relative to the same base year, was 120 in 2021 and 150 in 2023. Find the percentage increase in the cost of electricity from 2021 to 2023 (not from the base year).
- 6th March 1999The probability that a train is late is 0.15. Out of 200 trains, how many would you expect to be late?
- 7th March 1999The probability that a machine produces a faulty item is 0.04. Out of 300 items, how many would you expect to be faulty?
- 8th March 1999A box has 3 faulty bulbs out of 10. Two bulbs are chosen without replacement. Find the probability at least one is faulty.
- 9th March 1999In a pyramid, the bars for ages 65+ are unusually long compared with younger age bands. Give one possible reason.
- 10th March 1999A data set has mean 12, median 12, mode 12. Describe its skew.
- 11th March 1999A sample of 80 light bulbs from a batch of 2000 found 4 were faulty. Estimate the number of faulty bulbs in the whole batch.
- 12th March 1999The mean of 6 numbers is 15. Five of the numbers are 10, 12, 14, 18, 20. Find the sixth number.
- 13th March 1999State one advantage of random sampling.
- 14th March 1999What is meant by a control variable?
- 15th March 1999Values of 12, 18, 25, 31, 9, 22, 15 are grouped using intervals 0 <= x < 10, 10 <= x < 20, 20 <= x < 30, 30 <= x < 40. State the frequency of the interval 10 <= x < 20.
- 16th March 1999A pie chart shows four categories with angles 90, 120, 60 and x degrees. Find x.
- 17th March 1999Events A and B are mutually exclusive with P(A) = 0.3 and P(B) = 0.25. Find P(A or B).
- 18th March 1999Explain why estimating a y-value for x = 50 would be unreliable if all the plotted data only covers x-values from 0 to 20.
- 19th March 1999Two variables have a correlation coefficient close to 0. What does this suggest?
- 20th March 1999The Spearman's rank correlation coefficient between temperature and ice cream sales for 8 days is rs = 0.95. Describe the correlation.
- 21st March 1999A pilot survey shows that many respondents left a question blank. What might this suggest about the question?
- 22nd March 1999A researcher records the exact temperature of 30 cups of tea to the nearest 0.1 degrees C. State the type of data, giving two features.
- 23rd March 1999Group A has 4 items with mean 12. Group B has 4 items with mean 20. Find the combined mean.
- 24th March 1999The number of pets owned by 15 households, recorded as collected, is: 0,1,2,1,0,3,1,2,0,1,1,2,0,1,2. Complete a frequency table for the number of pets and state the total frequency.
- 25th March 1999A bar chart shows 3 bars: Dogs 12, Cats 9, Rabbits 5. How many pets are shown in total?
- 26th March 1999Using the same diagram (0|5 8, 1|2 2 6, 2|1), what is the range?
- 27th March 1999A cumulative frequency graph shows that a cumulative frequency of 45 corresponds to a value of 60 on the horizontal axis, out of 90 total data values. How many data values are above 60?
- 28th March 1999What is the purpose of the key on a choropleth map?
- 29th March 1999A data set of 50 exam scores has the 20th percentile at 42 marks and the 80th percentile at 78 marks. Explain what these two values tell you about the middle 60% of scores.
- 30th March 1999Which spreadsheet formula would you use to find the total of the values in cells B2 to B20?
- 31st March 1999A supermarket wants to know if a new till layout reduces queuing time. Write a suitable statistical question for the start of the enquiry cycle.