CBSE 2023 · Region 2 · Set 1 · Q38

Computer-based learning (CBL) refers to any teaching methodology that makes use of computers for information transmission. At an elementary school level, computer applications can be used to display multimedia lesson plans. A survey was done on $\displaystyle 1000$ elementary and secondary schools of Assam and they were classified by the number of computers they had.

Number of Computers	$\displaystyle 1$-$\displaystyle 10$	$\displaystyle 11$-$\displaystyle 20$	$\displaystyle 21$-$\displaystyle 50$	$\displaystyle 51$-$\displaystyle 100$	$\displaystyle 101$ and more
Number of Schools	$\displaystyle 250$	$\displaystyle 200$	$\displaystyle 290$	$\displaystyle 180$	$\displaystyle 80$

One school is chosen at random. Then :

(i)

Find the probability that the school chosen at random has more than $\displaystyle 100$ computers.

(ii)

(a)OR(b)

Find the probability that the school chosen at random has $\displaystyle 50$ or fewer computers.

(iii)

Find the probability that the school chosen at random has $\displaystyle 10$ or less than $\displaystyle 10$ computers.