Question 473766
The empirical probability that an iris bulb will bloom should be 48/62 or in lowest terms 24/31.

The number of bulbs to plant for 53 to bloom should be (x) * (24/31)   = 53,

or 53 / (24/31)  = 53 * (31/24)   = 68.46.

Therefore, we must plant 69 bulbs to satisfy the probability that 53 will bloom.

Cleomneius.