The scores on a test form a normal distribution with a mean of 78 and a standard deviation of 6. A test is selected at random. Find the probability the score is above 87.
What will be an ideal response?
0.0668
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Solve the problem.A measure of diversity of species in an ecological community is given by the formula 
where P1, P2, ... ,Pn are the proportions of a sample belonging to each of n species found in the sample. A bog in northeastern Illinois has 5 species of birds with these proportions: cardinal, 0.204; robin, 0.28, sparrow, 0.217; oriole, 0.248; woodpecker, 0.051. Find the index of diversity, H.
A. 2.1782193 B. -2.1782193 C. -2.3299917 D. 2.3299917
Provide an appropriate response. What is the mode price of the used cars?
A. $9,650 B. $5,325 C. $5,450 D. There is no mode for this data set.
Use a calculator to solve the equation on the interval [0, 2?). Round the answer to two decimal places.tan x = 2.0
A. 1.11, 4.25 B. 1.11, 5.17 C. 1.11, 2.68 D. 1.11, 2.03
Solve the problem.Find the sum of the first 5 terms of the geometric sequence with first term 1 and common ratio -3.
A. 61 B. -61 C. -121 D. 121