If the mean of 4 observations is 20 and when a constant C is added to each observation, the
mean becomes 22, the value of C is:
यदि 4 प्रेक्षणों का माध्य 20 है तथा प्रत्येक में एक नियतांक C जोड़ा जाए तो माध्य 22 हो जाता है, C का मान है
(a) -2
(b) 2
(c) 4
(d)6
Answers
Answered by
3
Answer:
2
Step-by-step explanation:
X/4=20............... Eq 1
X+4c/4=22...... Eq 2
X=80
So insert value of x in Eq 2
80+4c/4=22
Multiply by 4 on both sides
80+4c=88
4c=88-80
4c=8
C=2
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