Suppose a shop has two cashiers and one line of customers waiting to be served. The time for each cashier to serve the customer is an exponential random variable with \lambda = 1/4 and afterwards a customer leaves the store. Suppose both cashiers are busy with customers A and B, and customer C is the first in line to be served. What is the probability that among A, B, and C, C will not be the last to leave the store? Explain carefully. This question does not require extensive calculations.

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )

Yes the slope to this is -5