Seven pennies were tossed 100 times. The numbers of heads recorded were 40, 51, 42, 47, 40, 44, and 56. Find the standard deviation of the number of heads. Round your answer to two decimal places.
A) 217.43
B) 14.75
C) 23.45
D) 15.25
E) 320.00
B) 14.75
Mathematics
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Use the data to construct a frequency distribution.
First Class = 19-20
A. 
B. 
C. 
D. 
Mathematics
Find the exact value of the expression.tan 345°
A. 
B. 2 + 
C. -2 - 
D. 
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Simplify the expression. Assume that all variables are positive.
? 
A. 
a2
B. 
C. 
a2
D. 5a
Mathematics
Simplify the expression.64-4/3
A. - 
B. 256
C. 
D. not a real number
Mathematics