Calculate the Probability

A bag contains 80 balls of such 20 are red, 25 are blue and 35 are white.  A ball is picked at random what is the probability that the ball picked is as:

(i)  Red ball

(ii) Black ball

(iii) Red or Blue ball.

Solution

(i) Probability of a red ball = number of red ball in the bag/total balls in the bag

= P(R)

= 20/80

= 1/4

(ii) Probability of black ball =  number of red ball in the bag/total balls in the bag

= P (B)

= 0/80

= 0 

(iii) P(R or B) = 20/80 or 25/80 = 20/80 + 25/80

=  9/16

Note: in probability or is replaced by a plus (+) sign.  Look addition rule.

Posted Date: 2/18/2013 6:57:19 AM | Location : United States

Ask an Expert

Related Discussions:- Calculate the probability, Assignment Help, Ask Question on Calculate the probability, Get Answer, Expert's Help, Calculate the probability Discussions

Write discussion on Calculate the probability
Your posts are moderated

Write your message here..

Related Questions

Basics of series - sequences and series, Series - The Basics That top... Series - The Basics That topic is infinite series.  So just define what is an infinite series?  Well, let's start with a sequence {a n } ∞ n=1 (note the n=1 is for convenie

Decimals to fractions, change 5.075 to a fraction change 5.075 to a fraction

Understanding Logistics, How can i get a better understanding of logistics ... How can i get a better understanding of logistics without having a degree on logistics and knowledge of it? Simply, in a very basic form..

Some interpretations of the derivative, Some interpretations of the derivat... Some interpretations of the derivative Example    Is f ( x ) = 2 x 3 + 300 +4 increasing, decreasing or not changing at x = -2 ? Solution:  We already know that the rate

Theorem on intervals of validity, Theorem Consider the subsequent IVP.... Theorem Consider the subsequent IVP. y′ =  p (t ) y = g (t )  y (t 0 )= y 0 If p(t) and g(t) are continuous functions upon an open interval a o , after that there i

Converting decimals into fractions, 3.6 in a fraction 3.6 in a fraction

Point of intersection, Equation of line joining(0,0)and point of intersecti... Equation of line joining(0,0)and point of intersection of X2+Y2+2XY=4 , 3x2+5y2-xy=7 is solution) The two equations above represent pair of straight lines. We can complete the sq

Reasoning, logical reasoning logical reasoning

How to dealing with exponents on negative bases, How to Dealing With Expone... How to Dealing With Exponents on Negative Bases ? Exponents work just the same way on negative bases as they do on positive ones: (-2)0 = 1 Any number (except 0) raised to the

Economics, A mortgage lender seeks to maximize the expected value of its po... A mortgage lender seeks to maximize the expected value of its portfolio. The portfolio, of course, is the sum of all of the mortgages in it, so no generality is lost by examining t