Home
Class 12
MATHS
In Class XI of a school 40% of the st...

In Class XI of a school 40% of the students study Mathematics and 30% study Biology. 10% of the class study both Mathematics and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathematics

Text Solution

Verified by Experts

The correct Answer is:
`0.6`
Promotional Banner

Topper's Solved these Questions

  • PROBABILITY

    CBSE COMPLEMENTARY MATERIAL|Exercise FOUR MARK QUESTIONS|9 Videos

  • PROBABILITY

    CBSE COMPLEMENTARY MATERIAL|Exercise SIX MARK QUESTIONS|20 Videos

  • PROBABILITY

    CBSE COMPLEMENTARY MATERIAL|Exercise SIX MARK QUESTIONS|20 Videos

  • PRACTICE PAPER III

    CBSE COMPLEMENTARY MATERIAL|Exercise Section D|6 Videos

  • RELATIONS AND FUNCTIONS

    CBSE COMPLEMENTARY MATERIAL|Exercise SIX MARK QUESTIONS|7 Videos

Similar Questions

Explore conceptually related problems

In a class, 40% students study mathematics, 25% study biology and 15 % study both mathematics and biology. One student is selected at random. Find the probability that (i) he studies mathematics if it is known that he studies biology (ii) he studies biology if it is known that he studies mathematics.

In a class 40% students read Mathematics,25% Biology and 15% both Mathematics and Biology.One student is selected at random. The probability that he reads Biology if he reads Mathematics is

In a class 40% students read Mathematics,25% Biology and 15% both Mathematics and Biology.One student is selected at random. The probability that he reads Mathematics if it is known that he reads Biology is

In a school 25% students are failed in Mathematics, 15% in Physics and 5% students fail in both Mathematics and Physics. A student is selected at random. (i) If he is fail in Physics, find the probability that he is fail in Mathematics. (ii) If he is fail in Mathematics, find the probability that he in fail in Physics. (iii) Find the probability that he is fail either in Mathematics or in Physics.

In a class, 30% of the students offered mathematics, 20% offered chemistry and 10% offered both. If a student is selected at random, find the probability that he has offered mathematics or chemistry.

In a class 40% of the students offered Physics 20% offered Chemistry and 5% offered both. If a student is selected at random, find the probability that he has offered Physics or Chemistry only.

In a class, 5% of the boys and 10% of the girls have an IQ of more than 150. In this class 60% of the students are boys. If a student is selected at random and found to have an IQ of more than 150, find the probability that the student is a boy.

CBSE COMPLEMENTARY MATERIAL-PROBABILITY-TWO MARK QUESITONS
  1. A and B are two events such that P(A)!=0.Find P(B|A), if (i) A is a s...

    Text Solution

    |

  2. A random variable X has the following probability distribution find K.

    Text Solution

    |

  3. If P(A) = 1/2, P(A cup B) = 3/5 and P (B) =q find the value of q is A ...

    Text Solution

    |

  4. If (A)=3/10,P(B)=2/5 and P(AcupB)=3/5 then P(B/A)+P(A/B) equals to

    Text Solution

    |

  5. A die is rolled if the out come is an even number. What is the probabi...

    Text Solution

    |

  6. If A and B are two events such that P (A) =1/4, P(B) =1/2and P(AnnB)=...

    Text Solution

    |

  7. The probability that atleast one of the two events A and B occurs is 0...

    Text Solution

    |

  8. Three events A, B and C have probalities 2/5,1/3 and 1/2, respectively...

    Text Solution

    |

  9. A die, whose faces are marked 1, 2, 3 in red and 4, 5, 6 in green, is ...

    Text Solution

    |

  10. An urn contains 10 black and 5 white balls. Two balls are drawn from ...

    Text Solution

    |

  11. Prove that if E and F are independent events, then so are the events E...

    Text Solution

    |

  12. The probability distribution of discrete random variable X is given be...

    Text Solution

    |

  13. If P (A) = 7/3, P (B)= 9/13, "and" P(A cap B) = 4/13 , then find P (A/...

    Text Solution

    |

  14. In Class XI of a school 40% of the students study Mathematics and 3...

    Text Solution

    |

  15. If P(A)=0.4 P(B) = 0.8 and P (B/A) = 0.6 then find P(A cup B).

    Text Solution

    |

  16. A die has two faces each with number 1, three faces each with numbe...

    Text Solution

    |

  17. A coin is tossed 4 times. Find the mean and variance of the probabilit...

    Text Solution

    |

  18. There are 25 ticketsbearing numbers form 1 to 25 one ticket is drown a...

    Text Solution

    |