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The fourth class interval for a grouped data whose first and second class intervals are \(10-15\) and \(15-20\) respectively is _______.___
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Question

The fourth class interval for a grouped data whose first and second class intervals are \(10-15\) and \(15-20\) respectively is _______.___

Answer

\(25-30\)
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Solution

Here, we have given that the first interval is \(10-15\) and second interval is \(15-20 \). Since, difference between upper limit and lower limit in both intervals is  \(5\) .So, next interval will be 5 added to upper and lower limit of previous class . 
Hence, we can say that the third interval will be \(20-25\) and the fourth interval will be \(25-30 \)
Thus,  The fourth class interval for a grouped data whose first and second class intervals are \(10-15\) and \(15-20\) respectively is \(25-30\).
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