Question

In a group of 25 students at lunch, 10 prefer ketchup on their hamburger, 10 prefer mustard on

Answer 1

Answer:

15/25 or 3/5 or 60%

Step-by-step explanation:

P(K or M) = P(K) + P(M) - P(K and M)

               = $\frac{10}{25}$ + $\frac{10}{25}$ - $\frac{5}{25}$

               = $\frac{15}{25}$

               = .6 or 60%