The Test Scores of 40 Students Are Summarized in the Frequency

question 147

Multiple Choice

The test scores of 40 students are summarized in the frequency distribution below. Find the standard deviation.
$\begin{array}{r|c}\text { Score } & \text { Students } \\\hline 50 \text {-under } 60 & 8 \\60 \text {-under } 70 & 15 \\70 \text {-under } 80 & 6 \\80 \text {-under } 90 & 5 \\90 \text {-under } 100 & 6\end{array}$

• A)\(13.5\)
• B) \(12.2\)
• C) \(14.2\)
• D) \(12.8\)

---

Definitions:

Inner Ear

The inner part of the ear that contains structures responsible for hearing and balance, including the cochlea and vestibular system.

Spinothalamic Tracts

Nerve pathways in the spinal cord that carry sensory information related to pain and temperature to the brain.

Ventrolateral

Relating to the front and side of a bodily structure, often used in reference to specific parts of the brain or the body.

Thalamus

A midline symmetrical structure within the brain that relays sensory and motor signals to the cerebral cortex.