Find the Mean for the Given Frequency Distribution $\begin{array}{c|r}\text { Score } & \text { Frequency } \\\hline 60-69 & 3 \\70-79 & 12 \\80-89 & 7 \\90-99 & 2\end{array}$

question 18

Multiple Choice

Find the mean for the given frequency distribution.
-Find the approximate mean for the grouped frequency distribution. Use the class midpoint to represent each class. Round your answer to two decimal places.
$\begin{array}{c|r}\text { Score } & \text { Frequency } \\\hline 60-69 & 3 \\70-79 & 12 \\80-89 & 7 \\90-99 & 2\end{array}$

• A) \(79.50\)
• B) \(74.50\)
• C) \(78.12\)
• D) \(77.83\)

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Definitions:

Doublet

In spectroscopy, a pattern indicating two closely linked energy levels or particles, often seen in NMR or EPR spectroscopy.

NMR

Nuclear Magnetic Resonance, a spectroscopic technique used to study the structure of molecules by observing the interaction of nuclear spins with magnetic fields.

IR

Infrared spectroscopy, a technique used to identify molecular structures based on their absorption of infrared light, which causes molecular vibrations.

Doublet

A pattern seen in NMR spectroscopy indicating two adjacent hydrogen atoms influencing a signal.