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Technical Mathematics, Sixth Edition by Michael A. Calter Ph.D., Paul A. Calter

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21.9. CHAPTER 21 REVIEW PROBLEMS

Label each type of data as continuous, discrete, or categorical.

  1. The life of certain radios. Continuous

  2. The number of houses sold each day. Discrete

  3. The colors of the cars at a certain dealership. Categorical

  4. The sales figures for a certain product for the years 1970–80 are as follows:

    4.

    YearNumber Sold
    19701344
    19711739
    19722354
    19732958
    19743153
    19753857
    19763245
    19774736
    19784158
    19795545
    19806493

    Make an x-y graph of the sales versus the year.

  5. Make a bar graph for the data of problem 4.

  6. If we toss three coins, what is the probability of getting one head and two tails? 3/8

    5.

  7. If we throw two dice, what chance is there that their sum is 8? 5/36

  8. A die is rolled twice. What is the probability that both rolls will give a two? 1/36

  9. At a certain factory, 72% of the workers have brown hair, 6% are left-handed, and 3% both have brown hair and are left-handed. What is the probability that a worker chosen at random will either have brown hair or be left-handed, or both? 0.75

  10. What is the probability of tossing a five or a nine when two dice are tossed? 2/9

  11. Find the area under the normal curve between the mean and 0.5 standard deviation to one side of the mean. 0.1915

  12. Find the area under the normal curve between 1.1 standard deviations on both sides of the mean. 0.7286

  13. Find the area ...

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