In a local community, assume ages are normally distributed with a standard deviation of 20. In order to estimate the average age of people in the community, the following sample is taken: 78, 63, 75, 42, 55, 70, 68, 62, 53, 49. The mean of these data is 60.50. The lower bound of the 95% confidence interval for the mean age is 48.10. What is the upper bound for the 95% confidence interval

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.