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Question 8 . Refer to the data below.

82 48 54 66 54 40 52 50 X

When another value X is included in the data set, the mean is now 57.33. The value of X is closest to:

a) 70

b) 72

c) 68

d) 66

User Tyagi
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1 Answer

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The given data consists of a series of numbers: 82, 48, 54, 66, 54, 40, 52, 50, and X. The task is to determine the value of X that should be included in the series.

To find the value of X, we need to identify any patterns or relationships among the given numbers. One possible approach is to calculate the average (mean) of the existing numbers in the series.

To do this, we add up all the numbers and divide the sum by the total count of numbers:

(82 + 48 + 54 + 66 + 54 + 40 + 52 + 50) / 8 = 396 / 8 = 49.5

The average of the existing numbers is 49.5.

Now, since X is a part of the series, we can assume that the average also includes X. Therefore, to find the value of X, we can set up an equation:

(82 + 48 + 54 + 66 + 54 + 40 + 52 + 50 + X) / 9 = 49.5

Simplifying the equation:

(396 + X) / 9 = 49.5

Multiplying both sides of the equation by 9:

396 + X = 445.5

Subtracting 396 from both sides:

X = 445.5 - 396 = 49.5

Therefore, the value of X that should be included in the series is 49.5.

Alternatively, you could also notice that the given series of numbers is symmetrical around the middle number, 54. This suggests that X could be 54 as well, maintaining the symmetry of the series. However, without further context or information, this is only a possibility and not the only correct answer.

It is important to note that without more information or a specific pattern mentioned in the question, there may be multiple valid answers for the value of X

User John R Doner
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