Draw a percentage curve for the following distribution of marks obtained by700 students in an examination:MarksNo. of studentsMarksNo. of students0-99.50-5910210-194260-697120-296170-792330-3914080-89240-49250Find from the graph () the marks at the 20th percentile, andequivalent to a mark of 65.(i)the percentile

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Answered: Draw a percentage curve for the…

College Algebra

10th Edition

ISBN:9781337282291

Author:Ron Larson

Publisher:Ron Larson

Chapter5: Exponential And Logarithmic Functions

Section5.5: Exponential And Logarithmic Models

Problem 4ECP

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For a period of 11 years, the figures in the accompanying table were found for annual change in unemployment rate and annual change in mean employee absence rate due to own illness. Year Change in UnemploymentRate Change in Mean Employee Absence Rate Due to Own Illness (Y) 1 -0.2 0.2 2 -0.1 0.2 3 1.4 0.2 4 1.0 -0.4 5 -0.3 -0.1 6 -0.7 0.2 7 0.7 -0.1 8 2.9 -0.8 9 -0.8 0.2 10 -0.7 0.2 11 -1.0 0.2 a. Estimate the linear regression of change in mean employee absence rate due to own illness on change in unemployment rate. b. Interpret the estimated slope of the regression line. thanks.
The Consumer Price Index provides a means of determining the purchasing power of the U.S. dollar from one year to the next. To use the Consumer Price Index to predict a price in a particular year, we can set up a proportion and compare it with a known price in another year as follows:(price in year A)/(index in year A)=(price in year B)/(index in year B)In 1986 the Consumer Price Index was 109.6 and in 2010 it was 218.1. Find the amount that would be charged in 2010 for the use of the same amount of electricity that cost $110 in 1986. Give your answer to the nearest dollar.
Illustration 10.40. You are given the foilowing distributión of monthly income per family. Calculate the mean (X) and S.D. (S) for this distribution. What % of families fall in the interval X-S and Y+S ? Monthly income No. of families 30 100 120 120-160 25 160 - 200 20 200-240 15 240--280 10
Compute a 95% CI for the mean age (in years). (Enter your answer using interval notation. Round your numerical values to two decimal places.) in years (b) Compute a 95% CI for the mean white blood count (in thousands) (use the variable named "First WBC (x 1000) following admission") following admission. (Enter your answer using interval notation. Round your numerical values to two decimal places.) thousands (c) Compute a 90% CI for the mean white blood count (in thousands) (use the variable named "First WBC (x 1000) following admission") following admission. (Enter your answer using interval notation. Round your numerical values to two decimal places.) thousands
The population of a small country by year is shown in the table below. Year 1960 1955 284496 Population 367825 The absolute change in the between 1960 and 1965 is: 83329 The percentage change in the population between 1960 and 1965 : 773 • The average rate of change in the population between 1960 and 1965 is: Interpolate to predict the population of the state in 1963. • Interpolate to predict the population of the state in 1968. • Extrapolate to predict the population of the state in 1977. 1965 1970 510844 679471 (Round your answer to o ong decimal place) people per year (Give your exact answer) people people (Round to the nearest whole number) people (Round to the nearest whole number) people (Round to the nearest whole number)
The values under n, N, and (n/N,)x 100% for the following table are not real, they are presented here for reasons of clarity. Table 1: Age distribution. Age Group Number of Patients Size of Age Group in Catchment A rea (N,) Proportion (n/ N,)x100% (n) 0- 4 5 - 14 15 - 44 45 - 59 2 60 925 4675 5762 19.75 15.63 58.08 901 4213 7253 23.93 13.84 153 635 76 549 i. Explain why the use of the proportions (n,/ N, )x100%, i= 1, 2,. .. 5, in the construction of the multiple bar chart is comparatively better than the use of the number of patients, (n,). ii. Assuming you are the bio-statis tician, use the multiple bar chart to write a report to management Be guided by the purpose for which multiple bar charts are used.
At Center Hospital there is some concern about the high turnover of nurses. A survey was done to determine how long (in months) nurses had been in their current positions. The responses (in months) of 20 nurses were as follows. (a) Which percentile is the value 307 (Round to the nearest whole value above.) 30 is the th percentile. (b) Find the 16th percentile on the data. Locator = 16th percentile= 3,6,8,9,9, 12, 13, 15, 21, 24, 24, 26, 27, 28, 29, 30, 32, 37,37,43 (c) Find the Q₁ value on the data. Locator= Q₁ = (d) Find the Qs value on the data. Locator = Qs = (e) Find the Q2 value on the data. Q₂ = (f) Find the IQR of the data. IQR= (g) What are the Upper and Lower limits of the boxplot? Upper Limit= Lower Limit=
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The per capita energy consumption level (in kilowatt-hours) in a certain country for a recent year can be approximated by a normal distribution, as shown in the figure. H=2319 kWh (a) What consumption level represents the 7th percentile? (b) What consumption level represents the 16th percentile? (c) What consumption level represents the third quartile? (a) The consumption level that represents the 7th percentile is kilowatt-hours. (Round to the nearest integer as needed.) 0-591.7 kWh 319 2319 Kilowatt-hours 4319

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