Correct Answer: 159.8

Solution : As per the given table,
There are 40 girls with a height of less than 155 cm.
The number of girls with a height of 155 cm and above = 51 – 40 = 11
Assuming that the heights of the girls are uniformly distributed in each interval.
We can estimate the average height of these 11 girls.
6 girls are in the interval 155 cm to 160 cm.
$\therefore$ The average height in this interval = $\frac{155 + 160}{2}$ = 157.5 cm
5 girls are in the interval 160 cm to 165 cm.
$\therefore$ The average height in this interval = $\frac{160 + 165}{2}$ = 162.5 cm
The average height of the girls whose heights are 155 cm and above = $\frac{6 × 157.5 + 5×162.5}{11}$ = 159.8 cm
Hence, the correct answer is 159.8.