Question

in an examination the mean of marks scored by a class of 10 students was calculated as 75. Later on, it was discovered that marks of one student was wrongly taken as 54 instead of 45. Find the corrected mean?
a) 78.25
b) 70.5
c) 74.1
d) 73.4​

Answer 1

Step-by-step explanation:

Given In an examination the mean of marks scored by a class of 10 students was calculated as 75. Later on, it was discovered that marks of one student was wrongly taken as 54 instead of 45. Find the corrected mean?

• Given Mean = 75
• We know that mean ∑ xi / N
• Or ∑ xi = 75 x 10
•            = 750
• We need to find corrected mean
• So corrected mean X bar = 750 – 54 + 45 / 10
•                                           = 741 / 10
•                                          = 74.1

Reference link will be

https://brainly.in/question/3103232

# BAL