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Of the students in a college, it is known that 60% reside in hostel and 40% are day scholars (not residing in hostel). Previous year results report that 30% of all students who reside in hostel attain A grade and 20% of day scholars attain A grad

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Of the students in a college, it is known that 60% reside in hostel and 40% day scholars (not residing in hostel). Previous year results report that 30% of all students who reside in hostel attain ‘A’ grade and 20% of day cholars attain ‘A’ grade in their annual examination. At the end of the year, one student is chosen at random from the college and he has an ‘A’ grade, what is the probability that the student is a hosteler?

Of the students in a college, it is known that 60% reside in a hostel and 40% do not reside in hostel. Previous year results report that 30% of students residing in hostel attain A grade and 20% of one’s not residing in hostel attain A grade in their annual examination. At the end of the year, one students is chosen at random from the college and he has an A grade. What is the probability that the selected student is a hosteller?

Of the students in a school, it is known that 30% have 100% attendance and 70% students are irregular. Previous year results report that 70% of all students who have 100% attendance attain A grade and 10% irregular students attain A grade in their annual examination. At the end of the year, one student is chosen at random from the school and he was found to have an A grade. What is the probability that the student has 100% attendance ? Is regularity required only in school ? Justify your answer.

In a certain city only two newspapers A and B are published, it is known that 25% of the city population reads A and 20% reads B, while 8% reads both A and B. It is also known that 30% of those who read A but not B look int advertisements and 40% of those who read B bu not A look into advertisements while 50% of those who read both A and B look into advertisements What is the percentage of the population reads an advertisement? [1984]

In a certain city, only two newspapers A and B are published. It is known that 25% of the city population reads A and 20% reads B, while 8% reads A and B. It is also known that 30% of those who rad A but not B, look into advertisements and 40% of those who read B but not A, look into advertisements while 50% of those who read both A and B, look into advertisement. What percent of the population read on advertisement?

The number of students in a college is 36996 .There was a decrease of 7.69% over the previous year,how many students were there last year? "

There are 90 students in a class out of which 60% are girls and the rest are boys. The average score of boys in english is 30% more than that of girls. If the average score of all the students in english is 56, then find the average score of only girls in english. एक कक्षा में 90 छात्र हैं, जिसमें से 60% लड़कियां हैं और बाकी लड़के हैं | लड़कों का अंग्रेजी में औसत प्राप्तंक (स्कोर ), लड़कियों की तुलना में 30% अधिक है | यदि अंग्रेजी में सभी छात्रों का औसत प्राप्तांक 56 है, तो अंग्रेजी में केवल लड़कियों का औसत प्राप्तांक कितना है?

MODERN PUBLICATION-PROBABILITY-EXERCISE 13 (d) (LATQ)
  1. As man is known to speak truth 3 out of 4 times. He throws a die and ...

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  2. Three bags contain : (i) 4 red and 4 black, 2 red and 6 black balls ...

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  3. (i) Bag I contains 3 red and 4 black balls while another bag II contai...

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  4. A bag contains 4 red and 4 black balls, another bag contains 2 red and...

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  5. (a) (i) Bag I contains 5 red and 3 black balls, Bag II contains 6 red ...

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  6. Given three identical boxes I, II and III, each containing two coins. ...

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  7. In a tape recorder factory three machines A, B and C produced 50%, 30%...

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  8. A company has two plants to manufacture scooters. Plant I manufactures...

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  9. An insurance company insured 2000 scooter drivers, 4000 car drivers...

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  10. A doctor is to visit a patient. From the past experience, it is known ...

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  11. (i) A man is known to speak the truth 3 out of 4 times. He throws a di...

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  12. A bag contains 4 balls. Two balls are drawn at random, and are foun...

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  13. Of the students in a college, it is known that 60% reside in hostel ...

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  14. A laboratory blood test is 99% effective in detecting a certain dis...

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  15. Suppose, a girl throws a die. If she gets a 5 or 6 she tosses a coin t...

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  16. There are three coins. One is a two headed coin (having head on both ...

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  17. In a certain college, 4% of boys and 1% of girls are taller than 1....

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  18. Bag I contains 2 white, 1 black and 3 red balls, Bag II contains 3 whi...

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  19. (i) Coloured balls are distributed in three bags as shown in the follo...

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  20. The members of a consulting firm rent cars from three rental agencies ...

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