Provide an appropriate response.The scores on an examination are normally distributed with ? = 75 and ? = 10. What percentage of the scores are between 70 and 90?
Fill in the blank(s) with the appropriate word(s).
62.47%
Mathematics
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Use a calculator to find the value of the expression rounded to two decimal places.cos-1 
A. 0.61 B. 0.96 C. 34.85 D. 55.15
Mathematics
Simplify.
A. 
B. 2
C. 
D. 2
Mathematics
Solve.A contractor finds that it takes Julie 11 hours to construct a wall of a certain size. It takes Leann 8 hours to construct the same wall. How long would it take if they worked together?
A. 1 hr
B. 
hr
C. 19 hr
D. 4
hr
Mathematics
Solve the problem.The volume V of a given mass of gas varies directly as the temperature T and inversely as the pressure P. If V = 319.0 in.3 when 
and P = 10 lb/in.2, what is the volume when 
and P = 20 lb/in.2?
A. 107.5 in.3 B. 137.5 in.3 C. 117.5 in.3 D. 147.5 in.3
Mathematics