Let X denote the lifetime of a machine component with an exponential distribution. The mean time for the component failure is 2500 hours. Required:
What is the probability that the lifetime exceeds the mean time by more than 1 standard deviations?

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Find the value of x for which the lines are parallel.