hard · SAT Math
A fitness center surveyed 300 members about age group and personal-training (PT) use, shown in the two-way table below. PT: Yes : PT: No : Total Under 30 : 45 : 105 : 150 30 and older : 30 : 120 : 150 Total : 75 : 225 : 300 What is the difference between the probability that a randomly selected under-30 member uses personal training and the probability that a randomly selected member, of any age, uses personal training?
- 0.35
- −0.10
- 0.05
- −0.05
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