Daily Practice · Foundation
March 2016 5-a-day
Printing for a group?
The batch download puts all 2 tiers' March 2016 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in March 2016
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st March 2016The probability that a machine produces a faulty item is 0.04. Out of 300 items, how many would you expect to be faulty?
- 2nd March 2016A box has 3 faulty bulbs out of 10. Two bulbs are chosen without replacement. Find the probability at least one is faulty.
- 3rd March 2016In a pyramid, the bars for ages 65+ are unusually long compared with younger age bands. Give one possible reason.
- 4th March 2016A data set has mean 12, median 12, mode 12. Describe its skew.
- 5th March 2016A sample of 80 light bulbs from a batch of 2000 found 4 were faulty. Estimate the number of faulty bulbs in the whole batch.
- 6th March 2016The mean of 6 numbers is 15. Five of the numbers are 10, 12, 14, 18, 20. Find the sixth number.
- 7th March 2016State one advantage of random sampling.
- 8th March 2016What is meant by a control variable?
- 9th March 2016Values 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.
- 10th March 2016A pie chart shows four categories with angles 90, 120, 60 and x degrees. Find x.
- 11th March 2016Events A and B are mutually exclusive with P(A) = 0.3 and P(B) = 0.25. Find P(A or B).
- 12th March 2016Explain why estimating a y-value for x = 50 would be unreliable if all the plotted data only covers x-values from 0 to 20.
- 13th March 2016Two variables have a correlation coefficient close to 0. What does this suggest?
- 14th March 2016The Spearman's rank correlation coefficient between temperature and ice cream sales for 8 days is rs = 0.95. Describe the correlation.
- 15th March 2016A pilot survey shows that many respondents left a question blank. What might this suggest about the question?
- 16th March 2016A 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.
- 17th March 2016Group A has 4 items with mean 12. Group B has 4 items with mean 20. Find the combined mean.
- 18th March 2016The 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.
- 19th March 2016A bar chart shows 3 bars: Dogs 12, Cats 9, Rabbits 5. How many pets are shown in total?
- 20th March 2016Using the same diagram (0|5 8, 1|2 2 6, 2|1), what is the range?
- 21st March 2016A 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?
- 22nd March 2016What is the purpose of the key on a choropleth map?
- 23rd March 2016A 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.
- 24th March 2016Which spreadsheet formula would you use to find the total of the values in cells B2 to B20?
- 25th March 2016A supermarket wants to know if a new till layout reduces queuing time. Write a suitable statistical question for the start of the enquiry cycle.
- 26th March 2016Give one disadvantage of an observation study.
- 27th March 2016Two 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?
- 28th March 2016A 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?
- 29th March 2016Using two fair six-sided dice added together, how many ways can you score a total of 7?
- 30th March 2016Find the midpoint of the class interval 10-20.
- 31st March 2016A company's yearly profits are 10, 12, 11, 15, 14 thousand pounds over five years. Describe the general trend.