Last week 9 students took a statistics exam The mean score w

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 flight. 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. Calculate the standard deviation and match the answers to the set of data. Round your answers to 2 decimal places.

Solution

Let me take Question 2 as I have answered Q1 in the previous Post.

1.Mean is average of given numbers = sum of all numbers/ Number of obs = 10.75

2. Median = ? There are even number of oberservations. Therfore, sort the numbers in decreasing order. GO to n/2 and n/2 +1 th observation and average it to get the median. Therefore, median is average of 12 and 9. Which is 10.5

3. Mode is observation with highest frequency = 15, which is occuring 2 times in the dataset.