Last week 9 students took a statistics exam. The mean score was 72 %. Khaled, wh
ID: 3008428 • Letter: L
Question
Last week 9 students took a statistics exam. The mean score was 72 %. Khaled, who was sick, took the exam the next day. When his score was included, the mean score rose to 74 %. What was Khaled's exam score? In July 2003, the eight salespeople at ABC Air Conditioning sold the following numbers of split ac units: 15, 8, 15, 4, 12, 16, 7 and 9. What is the mean? Round your answer to 2 decimal places. What is the median? Round your answer to 1 decimal place. What is the mode? There are many flights from Dubai to India each day. The data below shows the number of minutes a flight was late (or early) in arriving in Bombay for a sample of 5 flights. To explain, a positive number means the flight was late, a value of 0 indicates it arrived on time, and a negative number indicates it was early. So the first flight was 4 minutes late and the last flight 10 minutes early. 4 12 -9 6 -10 Determine the median number of minutes the flights were late (or early). Calculate the variance for the above table. 201.6250 219.9545 60.2523 60.6410 Calculate the standard deviation and match the answers to the set of data. Round your answers to 2 decimal places. 5,4,6,8,3,9 6,6,5,7,6,6 9,5,3,7,4,9 3,3,3,3,4,3 0.37 0.58 2.34 4.32 0.73 2.11Explanation / Answer
Since 1 Question per post is allowed let me take up the 1 st Qn.
Let each paper be 100 marks. Therefore average marks scoared by 9 student is 72.
Let Khaled' score be X, after which the average score became 74.
Total marks of 9 student + Marks of Khaled = Total marks of 10 people
Therefore, 72*9+X = 74*10
X=740-648 = 92
Khaled' score was 92
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