146k views
2 votes
Estimate how many times a six-sided dice needs to be rolled to obtain the number 4 twenty times.

Twenty-four times
Sixty times
One hundred twenty times
Two hundred forty times

User Rohit Rane
by
7.5k points

1 Answer

4 votes

Given:

A dice is rolled.

To find:

How many times a six-sided dice needs to be rolled to obtain the number 4 twenty times.

Solution:

We know that, if we roll a dice then the possible outcomes are 1, 2, 3, 4, 5, 6.

Total possible outcomes = 6

So, the probability of getting a 4 in one roll is:


P(4)=(1)/(6)

Let n be the number of times the dice is rolled to obtain the number 4 twenty times. Then,


(1)/(6)* n=20


(n)/(6)=20


n=20* 6


n=120

Therefore, the correct option is C.

User Dave Chen
by
8.2k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories