EBK THINKING MATHEMATICALLY
6th Edition
ISBN: 9780100802728
Author: Blitzer
Publisher: YUZU
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Chapter 12.3, Problem 38E
The data sets give the ages of the first six U.S. presidents and the last six US. presidents (through Barack Obama).
| AGE OF FIRST SIXU.S. PRESIDENTS ATINAUGURATION | |
| President | Age |
| Washington | 57 |
| J. Adams | 61 |
| Jefferson | 57 |
| Madison | 57 |
| Monroe | 58 |
| J. Q. Adams | 57 |
| Source: Time Almanac | |
| AGE OF LAST SIXU.S. PRESIDENTS ATINAUGURATION | |
| President | Age |
| Carter | 52 |
| Reagan | 69 |
| G. H.W. Bush | 64 |
| Clinton | 46 |
| G. W. Bush | 54 |
| Obama | 47 |
a. Without calculating, which set has the greater standard deviation? Explain your answer.
b. Verify your conjecture from part (b) by calculating the standard deviation for each data set. Round answers to two decimal places.
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Equilibrium Equations: Two-dimensional
2.28
Ra=
Rc=
2.29 (change force to 600N)
AC=
AB=
2.33
CD=
AC=
DE=
BC=
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By=
2.36
Ax=
Ay=
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Ay=_
Dx=
Dy=_
2.38 (change horizontal force to 2 kN)
Ax=
Ay=
Bx=
By=_
2.40
Ay=
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Cy=
Dy=
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