Median of the data seven 10,15 ,X,Y 27,30 is 17 after adding one observation 50 to the data median of new list is 18 then find the values of X and Y
Answers
Answer:
We have, 7, 10, 15, x, y, 27, 30
So, there are seven terms. that is n = 7
∴ Median = x [ ∵ $$\textbf{Median is $\bigg(\dfrac{n+1}{2}\bigg)^{th}$observation if n is odd.]}$$
⇒x=17 ....(1)
Again, 50 is added to the data.
∴ New data is 7, 10, 15, x, y, 27, 30, 50
So, there are eight terms. that is n = 8
∴ Median = 2x+y $$\textbf{ $\bigg[$$\because$$ \textbf{Median is }\dfrac{\bigg(\dfrac{n}{2}\bigg)^{\textbf{th}}+\bigg(\dfrac{n}{2}+1\bigg)^{\textbf{th}}\textbf{observation}}{2}$ if n is even}\bigg]$$
⇒2x+y=18
Cross-multiply,
x + y = 36 ....(2)
Step 2: Use the above results and evaluate unknown.
∴ From (2),
17 + y = 36 [Using (1)]
⇒y=19
Hence, answer is x = 17 and y = 19
Step-by-step explanation:
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