Rekha obtained 89, 90, 95, 90, 80 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What is her average marks?88.885909193

1. Break Down the Problem

To find Rekha's average marks, we need to:

1. Sum up all the marks she obtained.
2. Divide the total marks by the number of subjects.

2. Relevant Concepts

The formula for calculating the average is given by: $\text{Average} = \frac{\text{Total Marks}}{\text{Number of Subjects}}$

3. Analysis and Detail

1. Calculate Total Marks:

   • Marks obtained in each subject:
     • English: 89
     • Mathematics: 90
     • Physics: 95
     • Chemistry: 90
     • Biology: 80
   • Total Marks = $89 + 90 + 95 + 90 + 80$

   $\text{Total Marks} = 89 + 90 + 95 + 90 + 80 = 444$

2. Number of Subjects:

   • There are 5 subjects.

3. Calculate Average:

   • Average Marks = $\frac{444}{5}$

   $\text{Average Marks} = 88.8$

4. Verify and Summarize

The calculations have been verified. Adding up the individual marks yields a total of 444, and dividing this by 5 confirms that the average is indeed 88.8.

Final Answer

Rekha's average marks are $\mathbf{88.8}$.