A Local Search Service Company Surveys on the Number of Service

Essay

A local search service company surveys on the number of service centers available in three major cities for different brands of automobiles with an objective to improve the services to its customers. The data on the 20 automobile brands and the number of service centers are given below: $$\begin{array} { l | c } \text { Brands } & \begin{array} { c } \text { Number of } \\\text { service centers }\end{array} \\\hline \text { Audi } & 38 \\\text { BMW } & 42 \\\text { Mercedes-Benz } & 49 \\\text { Rolls-Royce } & 25 \\\text { Volkswagen } & 30 \\\text { Toyota } & 30 \\\text { Jaguar } & 42 \\\text { Nissan } & 35 \\\text { Ford } & 41 \\\text { Fiat } & 35 \\\text { Land Rover } & 34 \\\text { Chevrolet } & 29 \\\text { Ferrari } & 32 \\\text { Hyundai } & 15 \\\text { Porsche } & 35 \\\text { Skoda } & 42 \\\text { Tata } & 20 \\\text { Honda } & 23 \\\text { Renault } & 40 \\\text { Subaru } & 10\end{array}$$
a. How many automobile brands have centers between 20 and 29 in these three cities?
b. How many automobile brands have more than 40 centers in these cities?