Thirty 16 year old boys were tested to find their pulse rate. The following figures Were obtained for the number of beats per minute. Using the class intervals 51-55, 56-60, etc, of equal width, prepare a frequency table. 55 72 70 66 74 70 74 53 57 62 71 58 68 75 79 68 63 59 54 51 61 66 78 73 59 52 66 60 72 56.