Question
21 defective pens are accidentally mixed with 135
good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen is taken out is a good one.Solution
Numbers of pens = Numbers of defective pens + Numbers of good pens
∴ Total number of pens = 135 + 21 = 156 pens
P(E) = (Number of favourable outcomes) / (Total number of outcomes)
P(picking a good pen) = 135/156 = 0.865
More Probability Questions
What is the purpose of the "Animations" tab in PowerPoint?
Eena Khande is creating her project report as a document and is interested in typing the same in an easy-to-use software with facility of formatting pag...
Which software application is typically used for creating text documents?
What is the purpose of the CONCATENATE function in Excel?
Which out of the following is true about cell range in MS Excel?
What is the short cut key to centre the paragraph?
Which formula is used to join text from two cells in a spreadsheet?
To make the selected text bold, the shortcut key is ____
In Windows operating system it is the long horizontal bar at the bottom of a screen.
What is the file extension of Window Media Video file?
