Recall that the distribution of lengths of human pregnancies (measured in days, from conception to birth) follows the N(266,16) Normal curve.

Recall that the distribution of lengths of human pregnancies (measured in days, from conception to birth) follows the N(266,16) Normal curve. Suppose a SRS of size n = 50 births is drawn from the population of human mothers and the lengths of the corresponding pregnancies are recorded. Identify the standard deviation of the sampling distribution of xbar rounding to 4 decimal places (only give the numeric quantity, not the units)