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(a) The probability that the next change occurs in less than two days is 0.3085.
(b) The probability that the next change occurs in greater than seven days is 0.0067.
(c) The time of the next change that is exceeded with probability 90% is 6.02 days.
(d) The probability that the next change occurs in less than 10 days, given that it has not yet occurred after three days, is 0.9072.