Find the rank of 55 from the following data:
90, 85, 80, 80, 80, 80,78, 72, 69, 69, 55, 54

Answer

To find the rank of the number 55 in the given data set, we will follow these steps:

### Step 1: List the Data
First, we need to write down the data provided:
- Data: 90, 85, 80, 80, 80, 80, 78, 72, 69, 69, 55, 54

### Step 2: Arrange the Data in Ascending Order
Next, we will arrange the data in ascending order:
- Ordered Data: 54, 55, 69, 69, 72, 78, 80, 80, 80, 80, 85, 90

### Step 3: Assign Ranks
Now we will assign ranks to each number in the ordered list. The smallest number gets rank 1, the next smallest gets rank 2, and so on. If there are repeated numbers, they will receive the same rank, and the next number will skip the ranks accordingly.

- 54 → Rank 1
- 55 → Rank 2
- 69 → Rank 3 (both 69s get the same rank)
- 72 → Rank 5
- 78 → Rank 6
- 80 → Rank 7 (all four 80s get the same rank)
- 85 → Rank 8
- 90 → Rank 9

### Step 4: Identify the Rank of 55
From the ranks assigned, we can see that:
- The rank of 55 is 2.

### Conclusion
Thus, the rank of 55 in the given data is **2**.

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