Linus received 12 marks more in Test 2 than his score in Test 1. This was a 15% improvement. He then made another 4-mark improvement in Test 3.
(a) What was his score for Test 1?
(b) What was the percentage increase in his test score from Test 2 to Test 3?
Give your answer correct to 1 decimal place.

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected