Suppose that the lifetime of tv tubes are normally distributed with a standard deviation of 1.1 years. suppose that exactly 20% of tubes die before four years. find the mean lifetime of tv tubes?

The probability that a college student belongs to a health club is 0.3. the probability that a college student lives off-campus is 0.4. the probability that a college student belongs to a health club and lives off-campus is 0.12. find the probability that a college student belongs to a health club or lives off-campus. tip: p(a or b) = p(a) + p(b) - p(a and b) 0.54 0.58 0.70 0.82

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?

6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution