A survey team finds out that among all the female smartphone

A survey team finds out that among all the female smartphone users, 40% use iphone. Among all the male smartphone users, 30% use iphone. Among all the smartphone users, 55% are females. What is the percentage of iphone users among all the smartphone users? 35.5% 40% 45% 35% What is the percentage of females among all the iphone users 38% 55% 40% 62%

Solution

8. Perrcentage of Iphone users in All = 35.5%
9. Percentage Female among all Iphone users = 0.22/0.3555 = 0.618 ~ 62%

	Male	Female
Iphone	0.135	0.22	0.355	A1
NOT	0.315	0.33	0.645	A2
Totals	0.45	0.55	1
	B1	B2