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The probability of rolling any number of an wighted 6-sided die, with faces numbered 1 through 6, is directly proportional to the number rolled. What is the probability of getting 5, if the die is rolled only once?

Created: 6 years ago | Updated: 3 years ago

1/6

5/6

5/16

5/21

None of these

United Commercial Bank Ltd - Probationary Officer - 17.02.2017 গণিত সম্ভাব্যতা (Probability)

ব্যাখ্যা

0 590

best ans

If the probability of rolling a particular number is related to that number, then in 21( =  1   +   2   +   3   +   4   +   5   +   6) rollls, we'll have the following roll a '1' once, a '2' twice, a '3' thrice etc.
Then th probability of those number is 
p(1)  =  1/21
p(2)  =  2/21
p(3)  =  3/21
p(4)  =  4/21
p(5)  =  5/21
p(6)  =  6/21
 $∴$  The probability of getting 5, if the die is rolled only once is  $\frac{5}{21}$

6 years ago

Md Azizur Rahman

Founder of Satt

সম্ভাব্যতা (Probability)

.

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