The test marks of 16 students are: 52, 49, 88, 77, 84, 42, 79, 50, 71, 51, 85, 59, 62, 84, 60, 44. The marks are organised into the classes 40–49, 50–59, 60–69, 70–79, 80–89. Find the frequency of the class 50–59.
Remember: The class 50–59 starts at 50 and stops at 59. Both of those marks are in it, and 60 is not.
The test marks of 16 students are: 85, 69, 73, 89, 83, 59, 56, 57, 69, 60, 57, 70, 59, 71, 87, 45. The marks are organised into the classes 40–49, 50–59, 60–69, 70–79, 80–89. Find the frequency of the class 60–69.
The test marks of 16 students are: 79, 84, 43, 73, 69, 89, 76, 42, 80, 70, 66, 83, 78, 41, 56, 49. The marks are organised into the classes 40–49, 50–59, 60–69, 70–79, 80–89. Find the frequency of the class 70–79.
The test marks of 16 students are: 67, 78, 59, 60, 73, 50, 83, 58, 50, 86, 84, 49, 71, 44, 41, 53. The marks are organised into the classes 40–49, 50–59, 60–69, 70–79, 80–89. Find the frequency of the class 50–59.
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