Insulin injections and oral medication are two key options in diabetes treatment. The 2014 National Diabetes Statistics Report provides the breakdown of diabetes treatments among young American adults with diagnosed diabetes, as shown in the table.

Diabetes treatment Percent

Insulin only 14.0

Both insulin and oral medication 14.7

Oral medication only 56.9

Neither insulin nor oral medication 14.4

(a) Select the correct explanation for why this is a proper probability model. Is the sample space discrete orcontinuous?

All events in the sample space are included, and all the probabilities add up to1. The sample space isdiscrete.

All events in the sample space are included, and all the probabilities add up to1 The sample space iscontinuous.

(b) What is the probability that a randomly selected American adult diagnosed with diabetes is treated with insulin, either alone or combined with oral medication? (Enter your answer rounded to three decimalplaces.)

(Insulin only or insulin and oral medication)=

(c) What is the probability that a randomly selected American adult diagnosed with diabetes is not treated with insulin at all? (Enter your answer rounded to three decimal places.)

(No insulin at all)=