Probability. Can you help me?

Question

I can't figure out my homework. It says.. Use the table for Exercises 9-13. Estimate the probability of each event. The table says Results: Single-20, Double-12, Triple-2, Home Run-8, Walk-10, Out-28, and the Total is 80. #9 wants the probability of a batter getting a single, #10 wants the prob. of getting a double, #11 wants the prob. of getting a triple, #12 wants the prob. of getting a home run, and #13 wants the prob. of a batter getting an out. Can someone help me? I just don't understand it.

Answer 1

20+12+2+8+10+28=80

Probabilities are

single = 20/80 = .250

double = 12/80 = .150

triple = 2/80 = .025

homer = 8/80 = .100

walk = 10/80 = .125

out = 28/80 = .350

The probabilities must add up to 1.000

.250+.150+.025+.100+.125+.350 = 1.000