Daily Practice · Foundation
May 2015 5-a-day
Printing for a group?
The batch download puts all 2 tiers' May 2015 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in May 2015
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st May 2015Name the first stage of the statistical enquiry cycle.
- 2nd May 2015State one advantage secondary data has over primary data for a project on rainfall over the last 50 years.
- 3rd May 2015A data set has Q1 = 22 and Q3 = 35. State the interquartile range and explain what it measures.
- 4th May 2015A pictogram key shows 1 symbol = 4 books. A row has 2 and a half symbols. How many books does the row represent?
- 5th May 2015Two fair coins are flipped. How many equally likely outcomes are in the sample space?
- 6th May 2015A frequency table has classes 0-10, 10-20, 20-30 with frequencies 3, 9, 6. State all three coordinates for the frequency polygon.
- 7th May 2015On a time series graph, what is always plotted on the horizontal axis?
- 8th May 2015Group A has a risk of 0.08 of an event happening; Group B has a risk of 0.02. Find the relative risk of Group A compared with Group B.
- 9th May 2015A bag has 3 red, 4 green and 5 blue balls (12 total). One ball is removed at random and is blue. A second ball is then removed. Find P(second ball is red given the first ball was blue).
- 10th May 2015A 3D pie chart is used to show market share. Explain why 3D charts can be misleading.
- 11th May 2015A table has class intervals with frequency x midpoint totals of 45, 120, 90 and frequencies 5, 8, 6. Find the estimated mean.
- 12th May 2015Explain why a pilot survey should be carried out before the full survey is sent out.
- 13th May 2015Find the 4-point moving average of 12, 16, 20, 10.
- 14th May 2015P(rain) = 0.3 and P(snow) = 0.05 on a given day, and rain and snow are mutually exclusive that day. Find P(rain or snow).
- 15th May 2015Using the same histogram, how many students scored between 10 and 30 marks?
- 16th May 2015A box plot has lower quartile 10 and upper quartile 22. Find the interquartile range.
- 17th May 2015The heights (cm) of 6 plants are: 15, 18, 16, 14, 17, 150. Find the mean of the remaining values after removing the outlier.
- 18th May 2015Explain 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.
- 19th May 2015A 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.
- 20th May 2015Using the same table (0:4, 1:10, 2:4, 3:2), find the mean number of siblings.
- 21st May 2015The 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.
- 22nd May 2015A 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).
- 23rd May 2015The probability that a train is late is 0.15. Out of 200 trains, how many would you expect to be late?
- 24th May 2015The probability that a machine produces a faulty item is 0.04. Out of 300 items, how many would you expect to be faulty?
- 25th May 2015A box has 3 faulty bulbs out of 10. Two bulbs are chosen without replacement. Find the probability at least one is faulty.
- 26th May 2015In a pyramid, the bars for ages 65+ are unusually long compared with younger age bands. Give one possible reason.
- 27th May 2015A data set has mean 12, median 12, mode 12. Describe its skew.
- 28th May 2015A sample of 80 light bulbs from a batch of 2000 found 4 were faulty. Estimate the number of faulty bulbs in the whole batch.
- 29th May 2015The mean of 6 numbers is 15. Five of the numbers are 10, 12, 14, 18, 20. Find the sixth number.
- 30th May 2015State one advantage of random sampling.
- 31st May 2015What is meant by a control variable?