Statistics

The mean of 10 observations is 15.7. If a new observation 19 is added, the new mean is:

If the lower quartile Q1 is 20 and the upper quartile Q3 is 60, what is the value of the semi-interquartile range?

In a pie chart representing a student's time, if 'Sleep' takes 8 hours, what is its central angle?

Find the mean of the first n odd natural numbers.

If the median of a distribution is 25 and the mean is 25, find the mode using the empirical relationship.

For a data set where all values are the same (e.g., 7, 7, 7, 7), the variance is:

What is the Q3 of the marks: 2, 3, 5, 8, 9, 12, 15?

If Σf = 100, and the median is found at the 50th position, what is the value of N/2 used in the continuous median formula?

A student's marks in 5 subjects are 70, 75, 80, 85, and 90. What is the mean absolute deviation about the mean?

Find the mean of the first five prime numbers.

What is the mode of the data: 10, 20, 20, 30, 40, 40, 40, 50, 60?

Calculate the median of the following observations: 5, 12, 3, 18, 7.

In a bar chart, if the total frequency is 100 and a bar height is 25, what percentage does it represent?

What is the range of the following data: 102, 98, 105, 110, 95?

If the mean of x and 1/x is M, what is the mean of x^2 and 1/x^2?

What is the median of the first 7 natural numbers?

If the sum of 20 observations is 400, their mean is:

In a pie chart, a component representing 50% of the data has a central angle of:

The class mark of 15-25 is:

Which of the following is NOT a measure of central tendency?