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The ages (in years) at inauguration of the first 44 United States presidents are given below.

 

57, 61, 57, 57, 58, 57, 61, 54, 68, 51, 49, 64, 50, 48, 65, 

52, 56, 46, 54, 49, 51, 47, 55, 55, 54, 42, 51, 56, 55, 51, 

54, 51, 60, 62, 43, 55, 56, 61, 52, 69, 64, 46, 54, 47

 

(a) Make a stem-and-leaf plot of the data. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.)

 

Stem        |         Leaf

4

5

 

 

(b) How many presidents were in their 50s when they were inaugurated? 

 =________ presidents I had put 7 but I am wrong 

 

(c) What was the age of the oldest president? 

 69 yr

Guest Oct 1, 2018
 #1
avatar+3190 
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a) \(\left( \begin{array}{cc} 4 & \{2,3,6,6,7,7,8,9,9\} \\ 5 & \{0,1,1,1,1,1,2,2,4,4,4,4,4,5,5,5,5,6,6,6,7,7,7,7,8\} \\ 6 & \{0,1,1,1,2,4,4,5,8,9\} \\ \end{array} \right)\)

 

b) just count up the leafs of 5.  There are 25 of them

 

c) just look at the largest leaf of the largest stem.  You correctly got 69.

Rom  Oct 1, 2018

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