1. The raw score of a national mathematics exam has been standardized with the mean score of 30 and a standard deviation of 15. if 14000 students took the test. How many students scored marked between 15 and 45?

2. the item refers to the distribution below

14 16 20 10 6 10 10 6 25 16 30 16

If 10 is added to the distribution which of the following would be affected?

i. Mean

ii. Medium

iii. Mode

iv. Range