Answer:
I think the answer is (-3,1)
The mean is and standard deviation is . Then the variable .
Use substitution , then the variable .
The probability can be calculated in the following way:
for X=80, and . From the diagram .
Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80
Answer: The 4th Venn diagram. (A and B aren't touching, A and B are touching C though.)
12-2=10 b=10
Step-by-step explanation: