The Life Expectancy of a Fluorescent Light Bulb Is Given

question 90

Short Answer

The life expectancy of a fluorescent light bulb is given by the number of hours that it will burn. From the following frequency distribution, find the sample standard deviation of life of this type of bulb.
  $$\begin{array} { | l | l | l | l | } \hline \text { Life of bulb (hours) } & \text { Midpoint } x & \text { Frequency } f & \text { Product } x f \\\hline -0.5 - 499.5 & & 4 & \\\hline 499.5 - 999.5 & & 11 & \\\hline 999.5 - 1,499.5 && 13 & \\\hline 1,499.5 - 1,999.5 && 19 & \\\hline 1,999.5 - 2,499.5 && 28 & \\\hline 2,499.5 - 2,999.5 & & 34 & \\\hline 2,999.5 - 3,499.5 & & 13 & \\\hline 3,499.5 - 3,999.5 & & 3 & \\\hline\end{array}$$ Please round your answer to the nearest whole number, if necessary.
__________ h

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Definitions:

Stimulus Control

The modification of behavior by manipulating the factors that trigger or discourage it.

Antecedent

An event, condition, or cause that precedes and potentially triggers an effect or outcome.

Emitted

Released or given off, often used in the context of substances, light, sounds, or signals.

Self-monitoring Device

A tool or application used to track personal behaviors, symptoms, or physiological states, often for the purpose of health management or psychological self-assessment.