4.1.1 Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve. 4.1.2 Determine the weight of an 11-month-old baby whose weight-for-age relationship is on the 50th percentile curve. 4.1.3 Consider a 18-month-old baby with a weight of 11 kg: (a) On which percentile curve is this baby’s weight-for-age relationship? (b) Calculate the body mass index (BMI) for this baby if he is 80 centimetres tall. Use the formula: BMI = Weight (in kilogram) (Height in metres)²

NSC Mathematical Literacy Representing, interpreting and analysing data: 4.1.1 Explain what it means if t

4.1.1 Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve - NSC Mathematical Literacy - Question 4 - 2016 - Paper 1

Question 4

4.1.1 Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve. 4.1.2 Determine the weight of an 11-month-old baby whose weig... show full transcript

Worked Solution & Example Answer:4.1.1 Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve - NSC Mathematical Literacy - Question 4 - 2016 - Paper 1

Step 1

Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve.

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Answer

Being on the 85th percentile curve means that 15% of babies weigh more than this baby, while 85% weigh less. This indicates that the baby's weight is above average for their age group.

Step 2

Determine the weight of an 11-month-old baby whose weight-for-age relationship is on the 50th percentile curve.

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Answer

An 11-month-old baby on the 50th percentile weight-for-age curve typically weighs around 9.4 kg. This indicates that they are at the median weight compared to their peers.

Step 3

On which percentile curve is this baby’s weight-for-age relationship?

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Answer

The 18-month-old baby weighing 11 kg is on the 85th percentile curve, indicating that their weight is higher than that of most children their age.

Step 4

Calculate the body mass index (BMI) for this baby if he is 80 centimetres tall.

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Answer

To calculate the BMI, we use the formula: $BMI = \frac{Weight \ (in\ kilogram)}{(Height\ in\ metres)^2}$

First, convert the height from centimetres to metres: 80 cm = 0.8 m

Now insert the values into the formula: $BMI = \frac{11}{(0.8)^2} = \frac{11}{0.64} = 17.19 \ kg/m^2$

Thus, the BMI for the baby is approximately 17.19 kg/m².

4.1.1 Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve - NSC Mathematical Literacy - Question 4 - 2016 - Paper 1

Worked Solution & Example Answer:4.1.1 Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve - NSC Mathematical Literacy - Question 4 - 2016 - Paper 1

Explain what it means if the baby’s weight-for-age relationship is on the 85th percentile curve.

Determine the weight of an 11-month-old baby whose weight-for-age relationship is on the 50th percentile curve.

On which percentile curve is this baby’s weight-for-age relationship?

Calculate the body mass index (BMI) for this baby if he is 80 centimetres tall.

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