D Question 4
Apoll of 100 senior citizens in a retirement community asked about the types of
electronic communication they used. The table shows the joint and marginal frequencies
from the poll results.
If you are given that one of the people polled uses text messaging, what is the
probability that the person is also using e-mail? Express your answer as a decimal. If
necessary round your answer to the nearest hundredth.
Uses text messaging
Total
08
Uses e-mail
Yes No
Yes 0.16 0.64
No 008 0.12
Total 0.24 0.76
02
1