What will be the probability of getting a number less or equal to 4 ?

Step-by-step explanation:

if you need a fraction i believe it is 4/6 which simplifies to 2/3

b) the mean rose 5 points

Step-by-step explanation:

If you take these grades for example

95, 85, 92, 91, 96, 87, 92, 94, 98, 89, 88, 95, 91,84

and add them to get 1277, with a mean of 91  (1277 divided by 14)

then add 5 points to each of them to get

100, 90, 97, 96, 101, 92, 97, 99, 103, 94, 93, 100, 96, 89

and add them to get 1347, with a mean of 96  (1347 divided by 14)

You can see that the mean rose 5 points

I hope this helps.