Answer:
Step-by-step explanation:
2 csc²x-2 csc x-1=0
or

Answer:
mean=sum of data/no of data
=12/3
=4
Step-by-step explanation:
therefore mean=4
Answer:
4.4
Step-by-step explanation:
The mean is the sum of the data divided by the number of data values. so add them all together and then divide by how many numbers you added together.
Here is an example 1,3,4,5,7 so add 1+3+4+5+7=20 then you divide 20 by 5 and the mean is 4 for this example.
Step-by-step explanation:
wait, I will look my lecture last year
Answer:
I think its 7.5 but I might be wrong
Step-by-step explanation: