Daily Practice · Foundation
January 2013 5-a-day
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The batch download puts all 2 tiers' January 2013 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in January 2013
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st January 2013Explain why a value read from a cumulative frequency graph, such as the median, is described as an estimate rather than an exact value.
- 2nd January 2013On a choropleth map shaded from white (lowest) to black (highest), a region is coloured mid-grey. What does this suggest about its value?
- 3rd January 2013A cumulative frequency graph shows that a value of 18 corresponds to a cumulative frequency of 45 out of 60 total data points. Find the percentile.
- 4th January 2013A column of 8 test scores is in cells D2 to D9. Give the formula for the mean score.
- 5th January 2013Name the first stage of the statistical enquiry cycle.
- 6th January 2013State one advantage secondary data has over primary data for a project on rainfall over the last 50 years.
- 7th January 2013A data set has Q1 = 22 and Q3 = 35. State the interquartile range and explain what it measures.
- 8th January 2013A pictogram key shows 1 symbol = 4 books. A row has 2 and a half symbols. How many books does the row represent?
- 9th January 2013Two fair coins are flipped. How many equally likely outcomes are in the sample space?
- 10th January 2013A frequency table has classes 0-10, 10-20, 20-30 with frequencies 3, 9, 6. State all three coordinates for the frequency polygon.
- 11th January 2013On a time series graph, what is always plotted on the horizontal axis?
- 12th January 2013Group 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.
- 13th January 2013A 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).
- 14th January 2013A 3D pie chart is used to show market share. Explain why 3D charts can be misleading.
- 15th January 2013A table has class intervals with frequency x midpoint totals of 45, 120, 90 and frequencies 5, 8, 6. Find the estimated mean.
- 16th January 2013Explain why a pilot survey should be carried out before the full survey is sent out.
- 17th January 2013Find the 4-point moving average of 12, 16, 20, 10.
- 18th January 2013P(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).
- 19th January 2013Using the same histogram, how many students scored between 10 and 30 marks?
- 20th January 2013A box plot has lower quartile 10 and upper quartile 22. Find the interquartile range.
- 21st January 2013The heights (cm) of 6 plants are: 15, 18, 16, 14, 17, 150. Find the mean of the remaining values after removing the outlier.
- 22nd January 2013Explain 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.
- 23rd January 2013A 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.
- 24th January 2013Using the same table (0:4, 1:10, 2:4, 3:2), find the mean number of siblings.
- 25th January 2013The 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.
- 26th January 2013A 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).
- 27th January 2013The probability that a train is late is 0.15. Out of 200 trains, how many would you expect to be late?
- 28th January 2013The probability that a machine produces a faulty item is 0.04. Out of 300 items, how many would you expect to be faulty?
- 29th January 2013A box has 3 faulty bulbs out of 10. Two bulbs are chosen without replacement. Find the probability at least one is faulty.
- 30th January 2013In a pyramid, the bars for ages 65+ are unusually long compared with younger age bands. Give one possible reason.
- 31st January 2013A data set has mean 12, median 12, mode 12. Describe its skew.