First you do parenthesis, then you add and divide to get those variables by themselves, soon you will have the answer to your problem Hope this helped :) and I hope it wasn't a fishy answer>)))'>:(
0.45*0.2= 0.09
so probability that there will be oil after the test= 0.09 %
Answer:
2. (-2)(4)
Step-by-step explanation:
It can be turned into a mixed number: 
hope that helps :) ✨
⇒The Variance tells us spread between each variate in data set from mean.
Now, Coming to the Question
⇒Sample of 14 students were taken from a population of 168 students.
Variance =Expected value of square of each variate taken from mean, which can be represented as

Size of Sample taken in terms of Percentage

⇒Sample Size is Approximately only 8.4% of total Population,which is very small, that can't represent the whole Population Variance.
Option B:→ 14 , is most appropriate, which Represents the Variance of 14 student height.