Neco Model Questions Vol1 2024 Mathematics Question 21

Practice objective / multiple choice question 21 from the 2024 Neco Model Questions Vol1 Mathematics examination.

Neco Model Questions Vol1 2024 Mathematics Objective / Multiple Choice Hard Difficulty
Question 21 NECO_MODEL_QUESTIONS_VOL1 • 2024 • MATHEMATICS • objective

A class of 20 students sat a mathematics test. The mean score was 68 and the standard deviation was 6. It was later discovered that a student's recorded score of 80 was actually 90. Assuming the original statistics were computed correctly, determine the new mean and the new standard deviation (rounded to two decimal places).

Answer Options

Correct Answer A. Mean = 68.5, Standard deviation ≈ 7.26
B. Mean = 68.0, Standard deviation ≈ 6.00
C. Mean = 68.5, Standard deviation ≈ 6.50
D. Mean = 69.0, Standard deviation ≈ 7.00
Correct Answer
A
Correct Option:
Mean = 68.5, Standard deviation ≈ 7.26

About This Question

This is Neco Model Questions Vol1 2024 Mathematics Question 21. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Mathematics examination.

Difficulty level: Hard .

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