Neco 2024 Mathematics Question 18

Practice objective / multiple choice question 18 from the 2024 Neco Mathematics examination.

Neco 2024 Mathematics Objective / Multiple Choice Hard Difficulty
Question 18 NECO • 2024 • MATHEMATICS • objective

In a class of 30 students, the mean score of Exam A is \\(68\\) with a standard deviation of \\(5\\). The mean score of Exam B is \\(72\\) with a standard deviation of \\(6\\). The correlation coefficient between the two exam scores is \\(0.8\\). Assuming the scores are jointly normally distributed, find the mean and standard deviation of the total score (sum of the two exams). Give the standard deviation correct to two decimal places.

Answer Options

A. Mean = 140, Standard deviation = 7.81
B. Mean = 140, Standard deviation = 11.00
C. Mean = 138, Standard deviation = 10.44
Correct Answer D. Mean = 140, Standard deviation = 10.44
Correct Answer
D
Correct Option:
Mean = 140, Standard deviation = 10.44

About This Question

This is Neco 2024 Mathematics Question 18. It is one of the objective questions from the 2024 Neco Mathematics examination.

Difficulty level: Hard .

View More Neco 2024 Mathematics Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support