A random sample of computer users were asked which browser t

A random sample of computer users were asked which browser they primarily relied on for surfing the Internet and whether this browser was installed on a desktop or laptop computer. The following contingency table shows these results.

The probability that a randomly selected person from this sample used the Internet Explorer AND the Firefox browser is ________.

Laptop 56 37 Desktop Browser Internet Explorer Firefox Chrome Safari 18 24 18 er

Solution

Here row total is

Internet explorer 74

Firefox 44

And grand total is 250

Now we need to calculate probability of internet explorer and Firefox= 74/250*44/250 = 0.296*0.176 = 0.052096 (AND meand to multiply)