Let x be the time in minutes between two successive arrivals at the drive-up window of a local bank. if x has an exponential distribution with λ = 1, compute the following: (if necessary, round your answer to three decimal places.)

(a) the expected time between two successive arrivals is minutes.

(b) the standard deviation of the time between successive arrivals is minutes.

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

With this one. will mark brainliest

Hurry and answer this! circle x with a radius of 6 units and circle y with a radius of 2 units are shown which steps would prove the circles similar? translate the circles so they share a common center point, and dilate circle y by a scale factor of 4. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 4. translate the circles so they share a common center point, and dilate circle y by a scale factor of 3. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 3