Foundation November 2018 Paper 3 Q22
22 A newborn baby has an approximate mass of 3.5 kilograms.
A human cell has an approximate mass of \(2.7 \times 10^{-11}\) grams.
Use these values to estimate the number of human cells in a newborn baby.
Give your answer in standard form, correct to 2 significant figures. [5]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \(1.3 \times 10^{14}\) | 5 | B4 for \(1.30 \times 10^{14}\) or \(1.29[6\ldots] \times 10^{14}\) or 130 000 000 000 000 as final answers or B3 for \(1.3 \times 10^n\) (\(n \ne 0\)) or \(1.29[6\ldots] \times 10^{14}\) written in full or M3 for 3500 \(\div\) \((2.7 \times 10^{-11})\) oe or B2 for \(1.29[6\ldots] \times 10^n\) (\(n \ne 0\)) or figs 13 OR M1 for figs 35 \(\div\) figs 27 soi by figs 129[6…] B1 for 3500 or \(2.7 \times 10^{-14}\) oe or \(3.5 \times 10^3\) seen | For 5 marks and M marks, condone use of correctly rounded values in correct calculations E.g. 129 600 000 000 000 0.000 000 000 000 027 |