Find the weighted mean of the numbers in the table. Round to the nearest tenth.Five rats were inoculated against a disease. After an incubation period, the number of rats contracting the disease was noted. The experiment was repeated 20 times, with the results shown in the table.
A. 2.7 rats
B. 2.4 rats
C. 3.1 rats
D. 2.3 rats
Answer: D
Mathematics
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A. 
B. 
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Mathematics
Provide an appropriate response.A computer store purchased keyboards for resale. They will have a selling price of $28.50 each, but the store bought them for a 30% discount. How much did the store pay for each keyboard?
Fill in the blank(s) with the appropriate word(s).
Mathematics
Use a calculator to find the approximate value of the expression. Round the answer to two decimal places.cos 3
A. -1.00 B. 0.99 C. 1.00 D. -0.99
Mathematics
Perform the indicated operations and simplify the result. Leave the numerator and denominator in your answer in factored form.
A. 
B. 
C. 
D. 
Mathematics