1) Babies below the average birth weight when they are born are said to have low
birth weight. Babies with a low birth weight are more likely than other babies to
have health problems when they are older.
The bar graph below shows the percentage of babies with low birth weight
compared to the amount of cigarettes smoked by a mother per day during
pregnancy.
a) Fill in the results table of the data that had been collected.
Number of cigarettes
Percentage of babies with low
per day
birthweight
none
Less than 15
15 or more
b) What conclusions can you draw from the pattern shown on the bar graph?
2) A student investigated the size of snails in a wood. She collected 50 snails and
measured the size of each one.
Below are her results
Shell length/mm
0-1
2-3
4-5
6-7
8-9
10-11
12-13
Number of snails
6
20
13
7
3
1
0
a) Decide what is the best way of presenting these results to show any patterns
and present it below.
b) Write a short conclusion about the size of snails in the wood.
3) A student measured the mass of copper used in a reaction by measuring first
the beaker and then the beaker with the copper inside. The balance
measurements are below:
a) record the mass of the beaker and the mass of the beaker plus the copper
below:
mass of beaker only =
g
mass of beaker plus copper =
g
b) calculate the mass of the copper the student used.
The students then reacted the copper with acid. After the reaction he weighed
the beaker again to find out how much copper was left over.
c) Record the mass of the beaker plus left over copper =
g
d) using the mass of the copper at the start and the mass of the left over
copper at the end work out how much copper was used up in the reaction.