There are 25 students in a sixth-grade class. On a cold winter day in February, many of the students had runny noses and sore throats. After examining each student, the school nurse constructed the following table:

$\begin{array}{lcc}
& \text { Sore throat } & \text { No sore throat } \
\text { Runny nose } & 5 & 4 \
\text { No runny nose } & 6 & 10
\end{array}$

Find the probability that a randomly-selected student has a runny nose.
A) 0.64
B) 0.36
C) 0.20
D) 1.25

Question

There are 25 students in a sixth-grade class. On a cold winter day in February, many of the students had runny noses and sore throats. After examining each student, the school nurse constructed the following table:

$\begin{array}{lcc} 
& \text { Sore throat } & \text { No sore throat } \
\text { Runny nose } & 5 & 4 \
\text { No runny nose } & 6 & 10
\end{array}$
 
Find the probability that a randomly-selected student has a runny nose.
A) 0.64
B) 0.36
C) 0.20
D) 1.25

Quizplus · Accepted Answer

The total number of students in the class is 25. Out of those, 5 students have runny nose and sore throat. Therefore, the number of students who have a runny nose is 5+4=9. Probability is defined as the number of favorable outcomes divided by the number of possible outcomes. So, the probability of a randomly-selected student having a runny nose is 9/25 or 0.36.

There Are 25 Students in a Sixth-Grade Class Find the Probability That a Randomly-Selected Student Has a Runny