The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200? minutes, with the results shown in the table below. Complete? (a) and? (b) to the right. Arrivals Frequency 0 12 1 29 2 45 3 41 4 31 5 22 6 11 7 6 8 3 a. Compute the expected number of arrivals per minute. ?=3.043.04 ?(Type an integer or? decimal.) b. Compute the standard deviation. ?=1.765 (this answer is not right need help with B) ?(Type an integer or decimal rounded to three decimal places as? needed.)
Added by Nate C.
Step 1
To do this, we will multiply each number of arrivals by its frequency and then divide the sum by the total number of minutes (200). Mean = (0 * 12 + 1 * 29 + 2 * 45 + 3 * 41 + 4 * 31 + 5 * 22 + 6 * 11 + 7 * 6 + 8 * 3) / 200 Mean = (0 + 29 + 90 + 123 + 124 + 110 Show more…
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The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes with the results shown in the table below. Complete (a) and (b) to the right. Arrivals-Frequency: 0-26, 1-47, 2-40, 3-32, 4-23, 5-17, 6-9, 7-4, 8-2. a. Compute the mean number of arrivals per minute. (Round to three decimal places as needed.) b. Compute the standard deviation.
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