Probability of at least one encounter Suppose that in a large group of people, a fraction 0 ≤ r ≤ 1 of the people have flu. The probability that in n random encounters you will meet at least one person with flu is P = f ( n, r ) = 1 – (1 – r ) n . Although n is a positive integer, regard it as a positive real number. a. Compute f r and f n . b. How sensitive is the probability P to the flu rate r ? Suppose you meet n = 20 people. Approximately how much does the probability P increase if the flu rate increases from r = 0.1 to r = 0 11 (with n fixed)? c. Approximately how much does the probability P increase if the flu rate increases from r = 0.9 to r = 0.91 with n = 20? d. Interpret the results of parts (b) and (c).
Probability of at least one encounter Suppose that in a large group of people, a fraction 0 ≤ r ≤ 1 of the people have flu. The probability that in n random encounters you will meet at least one person with flu is P = f ( n, r ) = 1 – (1 – r ) n . Although n is a positive integer, regard it as a positive real number. a. Compute f r and f n . b. How sensitive is the probability P to the flu rate r ? Suppose you meet n = 20 people. Approximately how much does the probability P increase if the flu rate increases from r = 0.1 to r = 0 11 (with n fixed)? c. Approximately how much does the probability P increase if the flu rate increases from r = 0.9 to r = 0.91 with n = 20? d. Interpret the results of parts (b) and (c).
Probability of at least one encounter Suppose that in a large group of people, a fraction 0 ≤ r ≤ 1 of the people have flu. The probability that in n random encounters you will meet at least one person with flu is P = f(n, r) = 1 – (1 – r)n. Although n is a positive integer, regard it as a positive real number.
a. Compute fr and fn.
b. How sensitive is the probability P to the flu rate r? Suppose you meet n = 20 people. Approximately how much does the probability P increase if the flu rate increases from r = 0.1 to r = 0 11 (with n fixed)?
c. Approximately how much does the probability P increase if the flu rate increases from r = 0.9 to r = 0.91 with n = 20?
2. (5 points) Let f(x) =
=
-
-
- x² − 3x+7. Find the local minimum and maximum point(s)
of f(x), and write them in the form (a, b), specifying whether each point is a minimum
or maximum. Coordinates should be kept in fractions.
Additionally, provide in your answer if f(x) has an absolute minimum or maximum
over its entire domain with their corresponding values. Otherwise, state that there is no
absolute maximum or minimum. As a reminder, ∞ and -∞ are not considered absolute
maxima and minima respectively.
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