1. By predicting fertility and divorce rates as well as life-styles economic, demographers attempt toforecastthe economy during the next decade and beyond -- predicting which industries will flourish and whichwill falter. The following table gives a distribution of age groups in the U.S. for the year 2030.Age GroupRelativeAge GroupRelativefrequencyfrequency0-9.50.1249.5-59.50.129.5-19.50.1459.5-69.519.5-29.5k69.5-79.529.5-39.50.1679.5-89.50.0339.5-49.50.16b) By the year 2030, what proportion of Americans are expected to be more than 59.5 years of age?0.080.06

Result Sum of relative frequency=1

Answered: 1. By predicting fertility and divorce…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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On the basis of a population survey, there were 84.4 million males and 98.2 million females 25 years old or older in a certain country. The educational attainment of the males and females is shown in the accompanying table. Complete parts (a) through (d) below.
Adjusted Gross Incomes. The Internal Revenue Service (IRS) publishes data on adjusted gross incomes in the document Statistics of Income, Individual Income Tax Returns. The following relative-frequency histogram shows one year’s individual income tax returns for adjusted gross incomes of less than $50,000.
Mr. Akram handles his own investment and has done for so many years. Listed below is the holding time between purchase and sale of his collection of stock. 11 11 9 15 8 8 12 5 9 8 5 5 14 9 10 11 3 9 8 6 8 9. 5 11 4 8 12 8 6 11 9 7 Create the frequency distribution from above mentioned information? About 75% of stock sells in what time? Draw the cumulative frequency distribution.
Example 3: Draw the histogram, frequency curve and cumulative Frequency curve for the following distribution of 464 deaths from scarlet fever classified according to ages: Relative Cumulative Frequency (R.C.F.) Ages in years Number of deaths Cumulative Frequency (C.F.) 122 (F) 0-5 122 0.263 5-10 95 217 0.468 10-15 70 287 0.619 15-20 27 314 0.677 20-25 26 340 0.733 25-30 17 357 0.769 30-35 12 369 0.795 35-40 11 380 0.819 40-45 10 390 0.841 45-50 6. 396 0.853 50-55 7 403 0.869 55-60 403 0.869 60-65 26 429 0.925 65-70 35 464 1.000 Total 464
16 In 1970, the U.S. Armed Services instituted a lottery as a random selection process when 19- year old males were drafted into service. Each of the possible 366 possible birth dates was placed in a separate capsule and each capsule was placed in a large plastic drum. Those with the lowest lottery numbers were drafted before others. For example, the May 9th was 176. This meant that there would be 175 groups of males born on other days drafted before those who had been born on May 9th. The scatter plot below shows the median draft eligible number for each month of the year. The line that connects the points is sometimes called a median trace line. Which one of the following statement is TRUE? * Median Trace of Draft Lottery Numbers 240 220- 200- 180- 160 140 120 100 F M. A Median Draft Number to
???
1.37 Fur seals on St. Paul Island. Every year, hundreds of thou- sands of northern fur seals return to their haul-outs in the Pribilof Islands in Alaska to breed, give birth, and teach their pups to swim, hunt, and survive in the Bering Sea. U.S. commercial fur sealing operations continued on St. Paul until 1984, but despite a reduction in harvest, the population of fur seals has continued to decline. Possible reasons include climate shifts in the North Pacific, chang- es in the availability of prey, and new or increased interac- tion with commercial fisheries that increase mortality. Here are data on the estimated number of fur seal pups born on St. Paul Island (in thousands) from 1979 to 2014, where a dash indicates a year in which no data were collected:28 FURSEALS Arco Images GmbH/Alamy
Section 3.1, question 15

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