Haneet Gandhi and Yukti Sharma Solutions for Chapter: Data and Chance, Exercise 3: PREVIOUS YEARS' QUESTIONS

A coin is tossed $10$ times and the outcomes are observed as. What is the probability of getting Head?

$H, T, H, T, T, H, H, T, H, H$

($H$ is Head; $T$ is Tail)

The mean of the five observations $x, x+2, x+4, x+6, x+8$ is $11$. Then the mean of the first three observations is:

A bag has $5$ red marbles, $4$ green marbles and $3$ blue marbles. All marbles are identical in all respects other than colour. A marble is taken out from the bag without looking into it. What is the probability that it is a non-green marble?

Anisha and Amir study in Class VII. Anisha told Amit that if the marks in Mathematics of each student in the class are increased by $5$, the average would go up by $5$. She further says that it is true for all numbers. Amit does not agree and Anisha proves it by taking the case $n$, instead of $5$. Anisha is using:

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?

'Data Handling' at the upper primary stage focuses on:

The additive inverse of $S$, where $S=1-2+3-4+5-6+7-8+ ....... +49-50$, is ______.

What is the probability that a randomly selected factor from positive factors of $72$ is less than $11$?