Use the Grouped Data Formulas to Find the Indicated Mean

question 138

Multiple Choice

Use the grouped data formulas to find the indicated mean or standard deviation.
-The speeds of a random sample of 100 cars are recorded as they pass a highway checkpoint. The results are summarized in the frequency distribution below. Approximate the sample mean. $$\begin{array} { r | r } \text { Speed (mph) } & \text { Cars } \\\hline 30 - 39 & 3 \\40 - 49 & 17 \\50 - 59 & 50 \\60 - 69 & 19 \\70 - 79 & 11\end{array}$$

• A)56.3 mph
• B)54.5 mph
• C)61.9 mph
• D)59.1 mph

---

Definitions:

Transportation Cost

The expenses incurred in moving goods or materials from one location to another, including fuel, labor, and maintenance of vehicles.

Dollar Value

Refers to the worth of an item, product, or service expressed in terms of the amount of money that it can be bought or sold for in the market.

Differential Reinforcement

The process of reinforcing one response from a response class and neglecting to reinforce all other members of that class.