The human head is about 7.5% of a person's body mass. If you weigh 70 kg, how heavy, in grams, is your head

Mass of human head is 5,250 grams.

Explanation:

Given the following data;

Body mass = 70kg

Mass of human head = 7.5% = 0.075

We simply multiply the body mass by that of the human head;

0.075 * 70 = 5.25kg

To convert the mass in kilograms to grams;

We know that, 1 kilogram = 1,000 gram.

Therefore,

5.25kg = 5,250 grams

Hence, the mass of human head is 5,250 grams.