(35 points) a catalogue ordering operation maintains an ordering staff of 25 telephone operators, who take orders from customers. management wants to determine the proportion of time that operators are idle. a work sampling study was conducted at random over a four-day period, and the following random observations were recorded: a) if management wants the proportion of time from the work sampling study to be 4% accurate with a confidence level of 98%, how many additional sample observations should be taken? b) after half of the observations (calculated on part a), the proportion of operators idle is 25%. to maintain the same confidence interval and accuracy, how many additional observations are needed?

its electric no smoke

step-by-step explanation:

correct answer is c. just did it

step-by-step explanation:

one fourth of 9% = 2.25%

gavin is correct in saying : the equivalent quarterly interest rate would be

2.25%.

0 and 5 minutes

step-by-step explanation:

given that one morning eight buses arrive late by the number of minutes given below:

0 8 2 6 9 2 0 7 8

write these in ascending order

0   0 2 6 7 8 8 9

in the afternoon two more buses arrive at the bus stop say by x and y minutes late.

total number of buses = 10

median = average of 4th and 5th after arranging in ascending order

since 4th entry is 6, the values of x and y should be below 6

also given 0 is the mode so either x or y or both should be 0 because then only 0 gets the maximum frequency and hence mode

thus we have

0 0 0 2 6 7 8 8 9 and another unknown entry which is below 6.

since median is 3.5, we have the unknown entry to be 5 only because then only median =( 2+5)/2

thus the after noon buses were late by 0 and 5 minutes.