Calculations

Question 1

(2) Use the graph to calculate the change in the total number of cases of meningitis in 1999 compared with 2004.

Answer 1

(1600 + 1000) – (1400 + 200)/2600 – 1600/(1600 – 1400) + (1000 – 200)/200 + 800 (1)
= 1000

Question 2

In September 2011 there were 168 cases of whooping cough in the UK.
(2) Calculate the difference in the number of cases of whooping cough in
September 2011 and September 2012

Answer 2

1320 (1)

1320 – 168 = 1152

Question 3

(1) State the number of hours of darkness needed for a long day plant to flower

Answer 3

8-10 (hours)

Question 4

(2) A gardener has 500 short day plants. 85% of these plants flowered in March. Calculate the needed for a long day plant to flower.

Answer 4

(85/100) x 500 (1) or
(500/100) x 85 (1)
=425 (plants)

Question 5

(2) Calculate the difference in the mass of protein contained in 200 g of minced beef compared with 200 g of mycoprotein mince.

Answer 5

20 and 13.5
OR
40 and 27 (1)
= 13.0

Question 6

(1) Calculate the percentage increase in total cholesterol level in the blood over
this 10-year period.

Answer 6

25.0 %

Question 7

(2) Calculate the mean ADH level in the people without diabetes insipidus

Answer 7

(5.2 + 2.8 + 4.9 + 3.5 =) 16.4
(1)
(16.4/4 =) 4.1

Question 8

(3) Using the Punnett square, calculate the probability that individuals C and D could have a child with haemophilia.

Answer 8

XH Y
XH XHXH XHY
Xh XHXh XhY

25% / 0.25 / 1 in 4 probability of a child having haemophilia (1)

Question 9

(2) Calculate the percentage of woodlice found on the black squares.

Answer 9

13 (1)

65 (%)

Question 10

(1) Estimate the number of years that Homo habilis inhabited the Earth.

Answer 10

• any value between 0.7-0.9 million (years)