Question

The final marks in mathematics of $30$ student are as follows:
$53,61,48,60,78,68,55,100,67,90,75,88,77,37,64,58,60,48,62,56,44,58,52,64,98,$

$59,70,39,50,60$
Arrange these marks in the ascending order $30$ or $39$ one group $40$ to $49$ second group ,etc.
Now answer the following:
Which observations between $50$ and $60$ have not actually appeared?

Answer 1

Ascending order of the scores is,

$\to 37,39$

$\to 44,48,48$

$\to 50,52,53,55,56,58,58,59$

$\to 60,60,60,61,62,64,64,67,68$

$\to 70,75,77,78$

$\to 88$

$\to 90,98$

$\to 100$

Hence, The observations between $50$ and $60$ have not actually appeared are $51,54,57$