If a patient is selected at random, find these probabilities. A)Patient has had exactly 2 tests done. B) Patient has had at least 2 tests done.C) Patient has had at most 3 tests.D)Patient has had 3 or fewer tests done. E)Patient has had 3 or fewertests?

The frequency distribution shown here illustrates the number of medical tests conducted on 30 randomly selected emergency patients.

Number of tests performed Number of patients
0 12
1 8
2 2
3 3
4 or more 5

1 Answer
Apr 22, 2017

A) #1/15# B)#1/3# C)#5/6#

Explanation:

total number of patients#=30#

A) exactly #2# tests
frequency table shows that #2# people did #2# tests
#2/30 = 1/15#

B) at least #2# tests
#2+3+5 = 10#
#10/30=1/3#

C)at most #3# tests
#12+8+2+3=25#
#25/30=5/6#

[C, D, and E seem to be the same]