Question

based on sample of size 20 ,the mean value is 31.5 if two more observation 35 and 39, are added to the sample, then the new mean is what
1. 35.167
2. 32
3. 35.2
4. 29.5​

Answer 1

Answer:

The new mean is 32

Step-by-step explanation:

Mean = (Sum of all the observations provided)÷(Total number of observations)

Initial mean= 31.5

Initial number of terms=20

Therefore sum of all the observations provided = 20×31.5=630

Sum of terms after addition of two numbers= 630+ 35+39=704

Total number of terms =22

Final mean = 704÷22 =32