Statistics Quiz 6

Pulse rates per minute of a patient observed by the doctor are 72, 78, 90, 102 and 73. Then the average pulse rate is

In a cricket match an over contains six balls. In a T-20 Cricket match it was already 5 balls bowled in the last over. If Sachin hits six for the last ball the mean becomes 4 runs per ball in the over. But Sachin hits four runs. Then the mean score per ball in that over is

The mid value of the class 10 – 19 is

For the given scores $\overline X = 12$ and $\sum x_i = 192$, then n =

The mode of the scores 12, 11, 12, 9, 10, 9, 12 is

If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.

The median of rational numbers $\frac{1}{2}, \frac{2}{3}, \frac{5}{6}, \frac{1}{4}$ and $\frac{3}{5}$

Mean of $2.8,\frac{5}{2} , 5.2 , \frac{2}{5}$ is ……..

In the formula, $\overline X = \frac{\sum x_1}{n}$ the letter  $\overline X$ represents

A data is represented using the classes 20 – 29, 30 – 39, ………….., 120 – 129. What is the length of the class interval 90 – 99 ?