31.

·Data handling' at upper primary stage focuses on

• data organisation only

• techniques of data collection

• data collection, organisation and interpretation

• data interpretation only

The sum of mean, mode and median of the data 6, 3, 9, 5, 1, 2, 3, 6, 5, 1, 3 is

• 12

• 13

• 10

• 11

Natural numbers 4 to 15 are written on different slips (one number on one slip), kept in a box and mixed well. Renu picks up one slip from the box without looking into it. What is the probability that this slip bears a prime number?

• $\frac{1}{3}$

• $\frac{5}{12}$

• $\frac{2}{5}$

• $\frac{3}{11}$

There are 10 persons in a party. If each one of them shakes hand with others exactly once. The total number of handshakes is

• 105

• 55

• 45

• None of these

A man and his wife appear for an interview for two posts. The probability of husband's selection is $\frac{1}{7}$ and that of wife's selection $\frac{1}{5}$. What is the probability of only one of them will be selected ? 

• $\frac{1}{7}$

• $\frac{2}{7}$

• $\frac{2}{5}$

• $\frac{1}{5}$

Out of 12 observations arranged in ascending order, the sixth and seventh observations are 14 and 15 respectively. Find the median of all the 12 observations.

• 29

• 14.5

• 15

• None of these 

The mean of mode, median and range of the data 2, 1, 2, 3, 3, 6, 4, 8, 14, 9, 4, 8, 4 is

• 4

• 9

• 6

• 7

Which one of the following activities is not appropriate for 'data representation and data interpretation'?

• Survey

• Debate

• Newspaper report

• Project

$\mathrm{If} \mathrm{x} = \frac{2}{3} \mathrm{and} \mathrm{y} = \frac{3}{4}, \mathrm{then} \mathrm{a} \mathrm{rational} \mathrm{number} \mathrm{between} {\left(\mathrm{x} - \mathrm{y}\right)}^{ - 1} \mathrm{and} \left({\mathrm{x}}^{ - 1} - {\mathrm{y}}^{ - 1}\right) \mathrm{is}$

• $\frac{2}{3}$

• $- \frac{71}{2}$

• $- \frac{71}{12}$

• $\frac{1}{6}$

$$\begin{gathered} \mathrm{If} 0.001 + 1.01 + 1.001 - (1.03 \mathrm{x} 0.1) ( 1 ) + (1.11 + 0.1) + \mathrm{x} \\ = 1.4 \mathrm{x} {\left(\frac{1}{10}\right)}^{ - 1}, \mathrm{then} \mathrm{the} \mathrm{value} \mathrm{of} \mathrm{the} \mathrm{x} \mathrm{is} \end{gathered}$$

• 0.919

• 0.785

• 0.758

• 0.991