Daily Practice · Higher
February 2015 5-a-day
Printing for a group?
The batch download puts all 2 tiers' February 2015 sheets in a single PDF, each tier behind its own divider page - 56 sheets in one file.
Every sheet in February 2015
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 2015What is wrong with the question 'Do you not think school lunches are too expensive?'
- 2nd February 2015What does a moving average smooth out in seasonal data, and what does the result reveal?
- 3rd February 2015A card is drawn at random from a normal 52-card pack. Find P(drawing a King or a Queen).
- 4th February 2015A histogram of ages has 5 equal-width bars covering 0-10, 10-20, 20-30, 30-40, 40-50 with heights 3, 7, x, 9, 2, and a total of 35 people. Find x.
- 5th February 2015A box plot has lower quartile 10 and upper quartile 22. Find the interquartile range.
- 6th February 2015Test scores out of 50 are: 32, 28, 35, 30, 29, 31, 95. Which score cannot be correct, and why?
- 7th February 2015The masses of 500 apples are normally distributed with mean 120 g and standard deviation 10 g. Estimate the number of apples with a mass between 110 g and 130 g.
- 8th February 2015The equation of a regression line is y = 3 + 2x. Find y when x = 5.
- 9th February 2015A frequency table has intervals 0-10 (frequency 15) and 10-15 (frequency 20). Calculate the frequency density for each.
- 10th February 2015Using the data in the previous question, a delegate aged 65 attends. Is this delegate's age an outlier? Explain.
- 11th February 2015P(A) = 0.4, P(B) = 0.3, P(A and B) = 0.1. Find P(A or B).
- 12th February 2015Find the midpoint of the class interval 30-50.
- 13th February 2015Explain why a pilot survey should be carried out before the full survey is sent out.
- 14th February 2015Find the 3-point moving average of 14, 18, 20.
- 15th February 2015A game has four mutually exclusive outcomes: win, draw, lose, abandoned. P(win) = 0.45, P(draw) = 0.2, P(abandoned) = 0.05. Find P(lose).
- 16th February 2015Using the same histogram, how many students scored between 10 and 30 marks?
- 17th February 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?
- 18th February 2015A set of weekly pocket money amounts, in pounds, is: 5, 6, 5, 500, 7, 6. Identify the likely outlier.
- 19th February 2015IQ scores are normally distributed with mean 100 and standard deviation 15. Out of 1000 people, estimate how many have an IQ above 130.
- 20th February 2015A PMCC value of r = 0.85 is calculated for two variables. Describe the strength and direction of the correlation.
- 21st February 2015Two intervals both have frequency 30: one has width 5 and one has width 15. Explain which interval has the taller histogram bar, and why.
- 22nd February 2015A data set has Q1 = 15 and Q3 = 45. Calculate both outlier boundaries.
- 23rd February 2015P(A) = 0.55 and P(B) = 0.4. Events A and B are mutually exclusive. Find P(A or B).
- 24th February 2015A table has class intervals with frequency x midpoint totals of 45, 120, 90 and frequencies 5, 8, 6. Find the estimated mean.
- 25th February 2015Give one reason why the response options '0-5, 5-10, 10-15' are a poor choice for hours of homework.
- 26th February 2015Find the 4-point moving average of 8, 12, 16, 20.
- 27th February 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).
- 28th February 2015A histogram has unequal class widths. Explain why the height of a bar can no longer be read directly as the frequency.