Make all the x points opposite. For example -837 to +837
Harold has 2.384 kilograms of zinc
To convert grams to kg, multiply the gram value by 0.001 or divide by 1000.
Look at the table for the people that used Lithium.
There are 18 relapses, 6 No relapses with a total of 24 people.
The relative frequency for relapse, would be dividing the number of relapses by the total number of people.
This would be D. 18 / 24 = 75%