Daily Practice · Foundation
October 2015 5-a-day
Printing for a group?
The batch download puts all 2 tiers' October 2015 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in October 2015
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 2015What does a moving average smooth out in seasonal data, and what does the result reveal?
- 2nd October 2015P(A) = 0.4 and P(B) = 0.35, where A and B are mutually exclusive. Find P(A or B).
- 3rd October 2015A histogram has unequal class widths. Explain why the height of a bar can no longer be read directly as the frequency.
- 4th October 2015A box plot for 40 values has lower quartile 15 and upper quartile 25. Roughly how many of the 40 values lie between 15 and 25?
- 5th October 2015Explain why the median might be a more appropriate average to use on a data set with an outlier, instead of removing the outlier first.
- 6th October 2015A population falls from 8,000 to 7,600. Find the percentage rate of change, stating whether it is an increase or decrease.
- 7th October 2015A population of 90 people is split into 3 age groups: 30 aged 18 to 30, 40 aged 31 to 50, and 20 aged 51 or over. A stratified sample of 27 is needed. Find how many from the 51-or-over group should be sampled.
- 8th October 2015Using the same table (0:4, 1:10, 2:4, 3:2), find the range.
- 9th October 2015Team 1 has median height 165 cm and Team 2 has median height 172 cm. Write one comparison in context.
- 10th October 2015A base year value is 40 and this year's value is 50. Find the index number.
- 11th October 2015A spinner has 8 equal sections numbered 1 to 8. What is P(the spinner lands on a number greater than 5)?
- 12th October 2015A coin is flipped 50 times and lands on heads 27 times. Find the relative frequency of heads.
- 13th October 2015On a tree diagram, what do you do to find the probability of a single path through the branches?
- 14th October 2015On a pyramid where male bars point left and female bars point right, the bar for females aged 20-24 is longer than the bar for males aged 20-24. What does this tell you?
- 15th October 2015Describe, using the mean and median, how you could tell that a distribution is positively skewed without drawing a graph.
- 16th October 2015A sample of 25 students from a school of 500 found that 5 walk to school. Estimate how many of all 500 students walk to school.
- 17th October 2015Find the mean of 4, 7, 9, 12, 18.
- 18th October 2015A researcher wants a sample of 50 from a population of 500 using systematic sampling, with a random start of 4. List the first three people selected.
- 19th October 2015What is a control group used for?
- 20th October 2015A grouped frequency table has intervals of unequal width, 0 <= x < 10 and 10 <= x < 40. Explain why this could make the table misleading when drawing a histogram.
- 21st October 2015A pie chart represents 200 people. One sector has an angle of 45 degrees. How many people does it represent?
- 22nd October 2015Out of 25 pupils, 12 like football, 9 like tennis, and 4 like both. How many like neither sport?
- 23rd October 2015A scatter graph shows points that generally rise from bottom left to top right. What type of correlation does this show?
- 24th October 2015A scatter graph shows that as temperature increases, the number of hot drinks sold decreases. What type of correlation is this?
- 25th October 2015For a class, the Spearman's rank correlation coefficient between shoe size and spelling test score is rs = 0.15. Describe the correlation.
- 26th October 2015A company pilots its customer feedback survey on 20 customers before sending it to all 5000 customers. Explain why using only 20 people is still useful.
- 27th October 2015A student uses last year's census results for her project instead of running her own survey. Is this primary or secondary data?
- 28th October 2015A class of 15 students has a mean score of 30. When combined with another class of 25 students, the combined mean of all 40 students is 40. Find the mean score of the second class.
- 29th October 2015A survey of favourite colours gives: Red 6, Blue 9, Green 4, Yellow 5. How many people were surveyed in total?
- 30th October 2015A bar chart shows the bar for 'Bus' with height 40 and the bar for 'Walk' with height 25. How many more pupils travel by bus than walk?
- 31st October 2015A stem-and-leaf diagram has rows: 0|5 8, 1|2 2 6, 2|1. How many data values are there in total?