Question

the mean of 200 items is 48 and s.d is 3. the sum of squares of all items is

Answer 1

• The sum of square of all items is = 462600

Given-

• Total items is (n) = 200
• Mean of total items (x bar) = 48
• Standard deviation (s) = 3

∑x = n x bar = 200 (48) = 9600

Also, we know that

σ² = 1/n ∑ x² - (x bar)²

3² = 1/200 ∑ x² - (48)²

1/200 ∑ x² = 2304 + 9 = 2313

∑ x² = 2313 × 200 = 462600

Hence the sum of squares of all items is 462600

Answer 2

Answer:

Step-by-step explanation: