Daily Practice · Foundation
July 2001 5-a-day
Printing for a group?
The batch download puts all 2 tiers' July 2001 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in July 2001
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 2001A box has 3 faulty bulbs out of 10. Two bulbs are chosen without replacement. Find the probability at least one is faulty.
- 2nd July 2001In a pyramid, the bars for ages 65+ are unusually long compared with younger age bands. Give one possible reason.
- 3rd July 2001A data set has mean 12, median 12, mode 12. Describe its skew.
- 4th July 2001A sample of 80 light bulbs from a batch of 2000 found 4 were faulty. Estimate the number of faulty bulbs in the whole batch.
- 5th July 2001The mean of 6 numbers is 15. Five of the numbers are 10, 12, 14, 18, 20. Find the sixth number.
- 6th July 2001State one advantage of random sampling.
- 7th July 2001What is meant by a control variable?
- 8th July 2001Values 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.
- 9th July 2001A pie chart shows four categories with angles 90, 120, 60 and x degrees. Find x.
- 10th July 2001Events A and B are mutually exclusive with P(A) = 0.3 and P(B) = 0.25. Find P(A or B).
- 11th July 2001Explain why estimating a y-value for x = 50 would be unreliable if all the plotted data only covers x-values from 0 to 20.
- 12th July 2001Two variables have a correlation coefficient close to 0. What does this suggest?
- 13th July 2001The Spearman's rank correlation coefficient between temperature and ice cream sales for 8 days is rs = 0.95. Describe the correlation.
- 14th July 2001A pilot survey shows that many respondents left a question blank. What might this suggest about the question?
- 15th July 2001A 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.
- 16th July 2001Group A has 4 items with mean 12. Group B has 4 items with mean 20. Find the combined mean.
- 17th July 2001The 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.
- 18th July 2001A bar chart shows 3 bars: Dogs 12, Cats 9, Rabbits 5. How many pets are shown in total?
- 19th July 2001Using the same diagram (0|5 8, 1|2 2 6, 2|1), what is the range?
- 20th July 2001A 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?
- 21st July 2001What is the purpose of the key on a choropleth map?
- 22nd July 2001A 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.
- 23rd July 2001Which spreadsheet formula would you use to find the total of the values in cells B2 to B20?
- 24th July 2001A supermarket wants to know if a new till layout reduces queuing time. Write a suitable statistical question for the start of the enquiry cycle.
- 25th July 2001Give one disadvantage of an observation study.
- 26th July 2001Two classes have the same median test score. Class A has IQR = 6 and Class B has IQR = 15. Which class's scores are more consistent, and why?
- 27th July 2001A pictogram has a key of 1 symbol = 4 people. A town has 22 people who play chess. How many symbols, including any part-symbol, should be drawn?
- 28th July 2001Using two fair six-sided dice added together, how many ways can you score a total of 7?
- 29th July 2001Find the midpoint of the class interval 10-20.
- 30th July 2001A company's yearly profits are 10, 12, 11, 15, 14 thousand pounds over five years. Describe the general trend.
- 31st July 2001Out of 200 people who ate a certain meal, 10 became ill. What is the risk of becoming ill, as a fraction in its simplest form?