The chances to fail in Physis are 20% an...

The chances to fail in Physis are 20% and the chances to fail in Mathematics are 10%. What are the chances to fail in atleast one subject ?

0.28

0.38

0.72

0.82

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In an examination 30% of the students failed in Physics, 25% in Mathematics and 12% in both Physics and Mathematics. A student is selected at random. Find the probability that the student has failed in Physics, if it is known that he has failed in Mathematics. (ii) the student has failed at least one of the two subjects (ii) the student has passed at least one of the two subjects (iv) the student has passed in Mathematics if he failed in Physics.

In an examination of a certain class, at least 70% of the students failed in Physics, at least 72% failed in Chemistry, at least 80% failed in Mathematics and at least 85% failed in English. How many at least must have failed in all the four subjects ?

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.

Consider the given diagram 500 candidate appeared in an examination conducted for the tests in English , Hindi and Maths represented by the circle E H and M respectively . the diagram gives the number of candidates who failed in different tests ? What is the percentage of candidates who failed in atleast two subjects ?

In an examination of a certain class,at least 70% of the students failed in Physics,at least 72% failed in Chemistry,at least 80% failed in Mathematics and at least 85% failed in English.How many at least must have failed in all the four subjects?

A rifleman is firing at a distant target ansd hence, has only 10% chances of hitting it. Find the number of rounds, he must fire in order to have more than 50% chances of hitting it at least once.

In an examination, 53% of the candidates failed in science and 48% failed in mathematics. If 40% failed in both subjects, what percentage passed in both subjects? एक परीक्षा में 53% छात्र विज्ञान में अनुत्तीर्ण हुए तथा 48% गणित में अनुत्तीर्ण रह गए | यदि 40% दोनों विषयों में अनुत्तीर्ण रहे, तो दोनों विषयों में कितने प्रतिशत उत्तीर्ण हुए?

DISHA PUBLICATION-PROBABILITY -2-EXERCISE - 1 : CONCEPT BUILDER

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