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Write down the error interval for each of the following questions:
Question 1:     The weight of a crate, z, correct to 2 significant figures is 8,700kg. Write down the error interval for z
Question 2:     The length of a road, n, rounded to 2 decimal places is 18.62km. Write down the error interval for the length of the road.
Question 3:     The number of passengers on a coach, k, rounded to the nearest 10 is 20 people. Write down the error interval for k
Question 4:     A number, d, truncated to 2 decimal places is 10.23. Write down the error interval for d
Question 5:     A number, h, correct to 3 significant figures is 15.9. Write down the error interval for h
Question 6:     A number, k, rounded to the nearest whole number is 701. Write down the error interval for k
Question 7:     A number, b, rounded to 1 decimal place is 51.9. Write down the error interval for b
Question 8:     The weight of a suitcase, r, truncated to 1 decimal place is 7.4kg. Write down the error interval for the weight of the suitcase.
Question 9:     A number, c, rounded to the nearest whole number is 97. Write down the error interval for c
Question 10:     The number of daily commuters travelling by train, m, correct to 3 significant figures is 84,000. Write down the error interval for m
Question 11:     The area of a plot of land, p, correct to 1 significant figure is 1,000m². Write down the error interval for p
Question 12:     The weight of a pencil case, w, rounded to the nearest 100g is 500g. Write down the error interval for w

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