Question

Illustration 26. Find the Mean and Standard deviation from the following distribution:
Marks
48
8
No. of Students
8-12
12-16
2
1
Card Deviation​

Answer 1

Explanation:

Let z=μ +- nσ where μ is the mean and σ is the standard deviation and n is the multiple above or below. so lets calculate two standard deviations above the mean z=14.88 + 2x2.