The attendance of a class of 45 boys for 10 days is given as 40, 42, 30, 35, 45, 44, 41, 38, 44 and 41 then the mean attendance of a class is

Options

A. 39
B. 40
C. 41
D. 43

Answer

To find the mean attendance of the class, we will follow these steps:

### Step 1: List the attendance values
The attendance values for the 10 days are:
- Day 1: 40
- Day 2: 42
- Day 3: 30
- Day 4: 35
- Day 5: 45
- Day 6: 44
- Day 7: 41
- Day 8: 38
- Day 9: 44
- Day 10: 41

### Step 2: Calculate the sum of the attendance values
Now, we will add all the attendance values together:
\[ 40 + 42 + 30 + 35 + 45 + 44 + 41 + 38 + 44 + 41 \]

Calculating this step-by-step:
- \(40 + 42 = 82\)
- \(82 + 30 = 112\)
- \(112 + 35 = 147\)
- \(147 + 45 = 192\)
- \(192 + 44 = 236\)
- \(236 + 41 = 277\)
- \(277 + 38 = 315\)
- \(315 + 44 = 359\)
- \(359 + 41 = 400\)

So, the total sum of attendance is \(400\).

### Step 3: Count the number of days
The number of days for which attendance is recorded is \(10\).

### Step 4: Calculate the mean attendance
To find the mean attendance, we use the formula:
\[ \text{Mean} = \frac{\text{Sum of values}}{\text{Number of values}} \]
Substituting the values we have:
\[ \text{Mean} = \frac{400}{10} = 40 \]

### Conclusion
The mean attendance of the class is \(40\).

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