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In a study, it was found that 70% of patients with a certain disease are male. I

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Question: In a study, it was found that 70% of patients with a certain disease are male. If there are 400 patients, how many are expected to be male? (2020)

Options:

  1. 200
  2. 250
  3. 280
  4. 300

Correct Answer: 280

Exam Year: 2020

Solution: 

Expected male patients = 70% of 400 = 0.7 * 400 = 280.

In a study, it was found that 70% of patients with a certain disease are male. I

Practice Questions

Q1
In a study, it was found that 70% of patients with a certain disease are male. If there are 400 patients, how many are expected to be male? (2020)
  1. 200
  2. 250
  3. 280
  4. 300

Questions & Step-by-Step Solutions

In a study, it was found that 70% of patients with a certain disease are male. If there are 400 patients, how many are expected to be male? (2020)
  • Step 1: Understand that 70% means 70 out of every 100 patients are male.
  • Step 2: Convert 70% into a decimal. 70% as a decimal is 0.7.
  • Step 3: Multiply the total number of patients (400) by the decimal (0.7).
  • Step 4: Calculate 0.7 * 400 to find the expected number of male patients.
  • Step 5: The result of the calculation is 280, which means 280 patients are expected to be male.
  • Percentage Calculation – Understanding how to calculate a percentage of a total amount.
  • Basic Arithmetic – Applying multiplication to find the expected number of patients.
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