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Question: Plant scientists developed different varieties of corns that have a rich content of lysine which is a nutritious animal feed. A group of chicks were given this food to test the quality. Weight gains (in grams) of these chicks after 21 days are as recorded: 380, 321, 366, 356, 349, 337, 399, 384, 410, 329, 350, 340, 324, 396, 412, 420, 382, 318, 344, 438. By constructing a frequency distribution table for 7 classes, find the class interval in which the weight increase is maximum.


A ) 426 - 443
B ) 335 - 351
C ) 318 - 438
D ) 336 - 353

Steps to derive

1 Range of the data = higher value - lower value = 438 - 318 = 120

2 Width = Rangenumber of classes = 1207 = 17.14 18
 [Round to the higher value.]

3 Constuct the class limits (weight gains) with width 18, so that the least and highest values has been included.

4 The class limits, boundaries, tally marks and the frequency for each class (number of tally marks) are shown in the table.



6 The class interval in which the weight increase maximum is 336 - 353.
 [Frequency is more for the class 336 - 353.]



Hence the right answer is Option D

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