A certain disease has a mortality rate of 10%. If 1000 people are infected, how

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Question: A certain disease has a mortality rate of 10%. If 1000 people are infected, how many are expected to survive? (2019)

Options:

Correct Answer: 900

Exam Year: 2019

Solution:

If the mortality rate is 10%, then 90% will survive. Therefore, expected survivors = 1000 × 0.9 = 900.

A certain disease has a mortality rate of 10%. If 1000 people are infected, how many are expected to survive? (2019)

A certain disease has a mortality rate of 10%. If 1000 people are infected, how many are expected to survive? (2019)

Step 1: Understand the mortality rate. A mortality rate of 10% means that 10 out of every 100 people will not survive.
Step 2: Calculate the survival rate. If 10% do not survive, then 100% - 10% = 90% will survive.
Step 3: Convert the survival rate into a decimal. 90% as a decimal is 0.9.
Step 4: Multiply the total number of infected people by the survival rate. So, 1000 people × 0.9 = 900.
Step 5: Conclude that out of 1000 infected people, 900 are expected to survive.

Mortality Rate – Understanding the concept of mortality rate and its inverse, survival rate.
Basic Arithmetic – Applying basic multiplication to calculate expected survivors based on a percentage.