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In a survey, 70% of people prefer tea over coffee. If 10 people are surveyed, wh

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Question: In a survey, 70% of people prefer tea over coffee. If 10 people are surveyed, what is the expected number of tea drinkers?

Options:

  1. 5
  2. 7
  3. 8
  4. 6

Correct Answer: 7

Solution: 

Expected number = 70% of 10 = 0.7 * 10 = 7.

In a survey, 70% of people prefer tea over coffee. If 10 people are surveyed, wh

Practice Questions

Q1
In a survey, 70% of people prefer tea over coffee. If 10 people are surveyed, what is the expected number of tea drinkers?
  1. 5
  2. 7
  3. 8
  4. 6

Questions & Step-by-Step Solutions

In a survey, 70% of people prefer tea over coffee. If 10 people are surveyed, what is the expected number of tea drinkers?
  • Step 1: Understand that 70% means 70 out of every 100 people prefer tea.
  • Step 2: We want to find out how many people out of 10 prefer tea.
  • Step 3: To find this, we calculate 70% of 10.
  • Step 4: Convert 70% to a decimal, which is 0.7.
  • Step 5: Multiply 0.7 by 10 to find the expected number of tea drinkers.
  • Step 6: Calculate 0.7 * 10 = 7.
  • Probability and Expectation – Understanding how to calculate the expected value based on probabilities.
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