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you how tightly all the various data are clustered around the mean in a set of data.
For example, what is the average age of the students in a class? How close are the
ages? If all the students are the same age, the deviation is 0.
Write a program that prompts the user to enter ten numbers, and displays the
mean and standard deviations of these numbers using the following formula:
n
2
¢
x i
a
n
n
i
=
1
x i
x i
-
a
a
n
x 1
+
x 2
+ g +
x n
i
=
1
i
=
1
mean
=
=
deviation
=
c
n
n
n
-
1
Here is a sample run:
Enter ten numbers: 1 2 3 4.5 5.6 6 7 8 9 10
The mean is 5.61
The standard deviation is 2.99794
*5.46
( Reverse a string ) Write a program that prompts the user to enter a string and
displays the string in reverse order.
Enter a string: ABCD
The reversed string is DCBA
*5.47
( Business: check ISBN-13 ) ISBN-13 is a new standard for indentifying topics. It
uses 13 digits d 1 d 2 d 3 d 4 d 5 d 6 d 7 d 8 d 9 d 10 d 11 d 12 d 13 . The last digit d 13 is a checksum,
which is calculated from the other digits using the following formula:
10
-
( d 1
+
3 d 2
+
d 3
+
3 d 4
+
d 5
+
3 d 6
+
d 7
+
3 d 8
+
d 9
+
3 d 10
+
d 11
+
3 d 12 )%10
If the checksum is 10 , replace it with 0 . Your program should read the input as a
string. Here are sample runs:
Enter the first 12 digits of an ISBN-13 as a string: 978013213080
The ISBN-13 number is 9780132130806
Enter the first 12 digits of an ISBN-13 as a string: 978013213079
The ISBN-13 number is 9780132130790
Enter the first 12 digits of an ISBN-13 as a string: 97801320
97801320 is an invalid input
*5.48
( Process string ) Write a program that prompts the user to enter a string and dis-
plays the characters at odd positions. Here is a sample run:
Enter a string: Beijing Chicago
BiigCiao
 
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