Use the Frequency Distribution to Find the Mean

question 132

Short Answer

$\begin{array}{|lc|}\hline \text { Shipment time (hours) } & \text { Frequency t} \\\hline 22.5-27.5 & 23 \\27.5-32.5 & 401 \\32.5-37.5 & 794 \\37.5-42.5 & 703 \\42.5-47.5 & 503 \\47.5-52.5 & 41\\\hline\end{array}$ Use the frequency distribution to find the mean. Please round your answer to the nearest integer, if necessary.
Use the frequency distribution to find the sample standard deviation. Please round your answer to the nearest integer, if necessary.
Does the data form a normal distribution? Remember: if the data fall within 2% of the empirical rule of 68%, 95%, and 99.7% for one, two, or three standard deviations, respectively, they form a normal distribution.

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Definitions:

Volatile Memory

Memory that requires power to maintain the stored information, losing all stored data when the system's power is turned off, like RAM.

Random Access Memory (RAM)

A type of computer memory that can be accessed randomly, used for storing operating data and machine code currently in use.

Read-Only Memory (ROM)

A type of non-volatile memory used in computers and electronic devices, storing data permanently and typically containing the system's firmware.

Swap File

A file on a hard disk used as a temporary storage area for data that cannot be held in the main system memory.