Two balls are drawn in succession from a box containing 4 red and 2 white balls.
a) What is the probability of drawing a red ball on the second draw if the first one is not put back in the box after it is drawn?
b)What is the probability of drawing a red ball on the second draw if the first one is put back in the box after it is drawn?

Solution Preview

Part (a)
--------
There are two ways in which you can draw a red ball on the second draw : (i) You draw a red ball in Draw 1 and then draw another red ball on Draw 2 (without putting the first one back!) OR (ii) You draw a white ball in Draw 1 and then draw a red ball on Draw 2 (again without putting the first one back!)

Since there are 4 red balls and 2 white balls in the box, the probability of drawing a red ball in Draw 1 is 1/4 (one ...

... we can use the condition that sum of all the probabilities in an ... n 4 .2 / 4 When Z = 1.5714 we have probability value from ... a. We select an Ayreshire at random. ...

book review probability of random selection. ... Based on these data, graph a probability tree and compute the following probabilities: (a) What is the ...

Probability of Random Selection. ... Answer: 0.0150947. The probability of random selection is examined. The expert assumes the voltage in a circuit. ...

Random Selection and Probability. ... These probabilities represent the probability of one EBook out of the total sample having the specified characteristics. ...

... If you select a random sample of 25 sessions ... standard normal tables, we can find the probabilities as follows ... a. what is the probability that the sample mean is ...

... water from a supermarket prefer brand x. If a random sample of 425 such consumers is taken, what is the probability that between 35% and 38% prefer brand x? ...

... P (Z > 0.12) = 0.4522 250 σ Details Normal Probabilities. ...Probability for X > X Value 830 Z Value 0.12 ... you have drawn a simple random sample of size ...