Use the table of z-scores and percentiles to find the percentage of data items in a normal distribution that lie a. above and b. below the given score.z = -0.9
A. 18.41%, 18.41%
B. 81.59%, 18.41%
C. 0%, 100%
D. 18.41%, 81.59%
Answer: B
Mathematics
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Find the required quantity given the wire that lies along the curve r and has density ?.Moment of inertia Ix about the x-axis, where r(t) = 
t3/2i + (7t cos t)j + (7t sin t)k, 
A. Ix = 0
B. Ix = 98
C. Ix = 49
D. Ix = 
Mathematics
Solve the problem.Martha can rake the leaves in her yard in 2 hours. Her younger brother can do the job in 3 hours. How long will it take them to do the job if they work together?
A. 6 hr
B. 
hr
C. 
hr
D. 3 hr
Mathematics
Answer the question as instructed.84 means?
A. 8 ? 8 ? 8 ? 8 ? 8 B. 8 ÷ 4 C. 8 ? 4 D. 8 ? 8 ? 8 ? 8
Mathematics
Divide and, if possible, simplify.
÷ 
A. 
B. 
C. 
D. 
Mathematics