we know that
Minimum value=838
Maximum value=1443
Difference=1443-838=605
we have that
Lower Class Limit Upper-Class Limit
838 838+x
838+x 838+2x
838+2x 838+3x
838+3x 838+4x
838+4x 838+5x
838+5x 838+6x=1443
Find out the value of x
838+6x=1443
6x=1443-838
6x=605
x=100.83
therefore
the answer is
Lower Class Limit Upper-Class Limit
838 838+100.83=938.83
938.83 1039.66
1039.66 1140.49
1140.49 1241.32
1241.32 1342.15
1342.15 1443
Find out the frequency for each class
838-938.83 ----> (838,842) ---------> frequency=2 ok
938.83- 1039.66 -----> (945,1034,1025) --------> frequency=3 ok
1039.66-1140.49 -----> (1124,1136,1057,1130) ----> frequency=4 ok
1140.49-1241.32 -----> (1184) ----> frequency=1 ok
1241.32-1342.15 ----> (1247, 1249,1256) -----> frequency=3 ok
1342.15- 1443 -----> (1352,1439,1439,1368,1381,1342,1395) -----> frequency=7