$80$ bulbs are selected at random from a lot and their lifetime (in $hrs$) is recorded in the form of a frequency table given below:
Lifetime (in hours) $300$ $500$ $700$ $900$ $1100$ Frequency $10$ $12$ $23$ $25$ $10$
The probability that a bulb selected randomly from the lot has a lifetime less than $900$ hours is:
| Lifetime (in hours) | $300$ | $500$ | $700$ | $900$ | $1100$ |
| Frequency | $10$ | $12$ | $23$ | $25$ | $10$ |
The probability that a bulb selected randomly from the lot has a lifetime less than $900$ hours is:
- A$\frac{11}{40}$
- B$\frac{5}{16}$
- C$\frac{9}{16}$
- D$\frac{7}{16}$
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