A Biology Professor Claims That, on the Average, 10% of Her

question 9

Multiple Choice

A biology professor claims that, on the average, 10% of her students get a grade of A, 30% get a B, 35% get a C, 10% get a D, and 15% get an F. The grades of a random sample of 113 students were Recorded. The following table presents the results.

$\begin{array} { c | l l l l l } \text { Grade } & 1 & 2 & 3 & 4 & 5 \\\hline \text { Observed } & 3 & 34 & 38 & 12 & 26\end{array}$

Compute the expected frequencies.

• A) 3,34,38,12,26
• B) 0.027,0.301,0.336,0.106,0.23
• C) 11.3,33.9,39.55,11.3,16.95
• D) 22.6,22.6,22.6,22.6,22.6

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Definitions:

Night Terrors

A sleep disorder causing feelings of terror or dread, typically occurring in the non-REM sleep phases, often accompanied by screaming or flailing and with little to no recollection of the dream content upon waking.

Nightmares

Distressing dreams that wake the sleeper, often involving feelings of fear, anxiety, or sorrow.

Uncontrollable Sleepiness

Excessive drowsiness that cannot easily be controlled or resisted, often indicative of underlying sleep disorders.

Narcolepsy

A chronic sleep disorder characterized by overwhelming daytime drowsiness and sudden attacks of sleep, often with cataplexy.