The owner of Indian Line campgrounds was examined the occupancy rate vs age. The vacationers were divided into age groups that covered young adulthood ( 15 to 35),middle age ( 35 to 55) and adulthood( 55 to 75). Indian Line accommodated 120 vacationers in the month of July. Class interval Relative frequency 15 and under 35 0.25 35 and under 55 0.35 55 and under 75 0.40 How many middle age vacationers were accommodated in July