# The shell of the land snail Limocolaria martensiana has two possible color forms

The shell of the land snail Limocolaria martensiana has two possible color forms. streaked and pallid. In a certain population of these snails, 60% of the individuals have streaked shells. Suppose that a random sample of 10 snails is to be chosen from this population.(1) What is the mean number of streaked‐shelled snails?(2) What is the standard deviation of the number of streaked‐shelled snails?