How do find the fw (frequency within the interval)?

How do find [f w} = frequency within this interval. Based on the chart given if you are trying to find the percentile of 25. Overall, I just need help finding the (f w} = frequency within this interval. Please provide the stepbystep process how it was found. ___ __ __ __ 76-78 g; 2 88. 571% 79-81 m 3 34 97.14296 82-84 x l 35 100% 55, 58, 61, 62, 62, 64, 64, 65, 65, 66, 67, 67, 68, 63, 68, 68, 69, 69, 70, TI, 7]., 71, 72, 72, 73, 73,74, 74. 75. 76, 77, 79, 80. 80, 84 (L What is X25? 65.75 X25 = 63.5 + [(8.75 - 5)l5]"'3 = 65.75