Question

The probability that a radish seed will germinate is 0.7. a gardener plants seeds in batches of 11. find the standard deviation for the random variable x, the number of seeds germinating in each batch.

Answer 1

To calculate for the standard deviation given the probability, we use the formula:

s = sqrt (n p q)

where s is standard deviation, n is number of samples = 11, p is probability of success = 0.7, q = 1 – p = 0.30

s = sqrt (11 * 0.7 * 0.3)

s = 1.52