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In a class of 23 students, 16 have a brother and 15 have a sister. There are 11 students
who have a brother and a sister. What is the probability that a student chosen
randomly from the class is an only child?

Respuesta :

mhanifa

Answer:

  • 3/23

Step-by-step explanation:

  • 11 students have a brother and a sister
  • 16 students have a brother and 16 - 11 = 5 have a brother only
  • 15 students have a sister and 15 - 11 = 4 have a sister only

So out of 23 students:

  • 11 + 5 + 4 = 20 have a brother or sister or both

And therefore

  • 23 - 20 = 3

students have no brothers or sisters

The required probability is:

  • 3/23

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