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Statistics and Probability — MATHS STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9MATHSStatistics and Probability1 Mark
Question
Write the correct answer in the following:
In a sample study of 642 people, it was found that 514 people have a high school certificate. If a person is selected at random, the probability that the person has a high school certificate is:
  1. 0.5
  2. 0.6
  3. 0.7
  4. 0.8
✓

Answer

  1. 0.8
Solution:
We know that empricrical probability P(E) of an event E happen, is given by
$\text{P(E)}=\frac{\text{Number of trials in which the event happed}}{\text{Total number of trials}}$
Let E be the event that a person selected at random has a high school certificate.
$\text{P(E)}=\frac{\text{Numbers of person having high school certificate}}{\text{Total number of people in a sample study}}$
$=\frac{514}{642}=0.8$

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