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

question 40

Multiple Choice

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

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Definitions:

Primary Reinforcement

A reinforcing stimulus that satisfies a basic biological need or drive, such as food, water, or warmth.

Tertiary Reinforcer

A conditioned reinforcer that does not inherently satisfy a basic biological need but has acquired its reinforcing value through association with secondary and primary reinforcers.

Ratio Schedules

A reinforcement strategy where a response is reinforced after a certain number of responses, promoting higher rates of responding.