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Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 19. Use the empirical
rule to determine the following.
(a) What percentage of people has an IQ score between 43 and 157?
(b) What percentage of people has an IQ score less than 62 or greater than 138?
(c) What percentage of people has an IQ score greater than 119?
(a) ____ % (Type an integer or a decimal.)
(b) ____ % (Type an integer or a decimal.)
(c) ____ % (Type an integer or a decimal.)
8. Match the linear correlation coefficient to the scatter
diagram. The scales on the x- and y-axis are the same for
each scatter diagram.
(a) $r = -0.992$, (b) $r = -0.049$, (c) $r = -1$
(a) Scatter diagram (1) _____
(b) Scatter diagram (2) _____
(c) Scatter diagram (3) _____
(1) O I
(2) O II
(3) O III
OO II
OO I
OO II
Let the sample space be $S = \{1, 2, 3, 4, 5, 6, 7, 8, 9, 10\}$. Suppose the outcomes are equally likely. Compute the probability
of the event E = "an odd number less than 10."
(E) = ____ (Type an integer or a decimal. Do not round.)