Forced vital capacity(FVC), a standardmeasure of pulmonaryfunction,is thevolume of air a person can expel in 6 second. The standardized FVC follows approximately astandard normal distribution (i.e. Z-distribution). A child is considered to have a normal long growth if his or her standardized FVC iswithin 1.5 standard deviation of the mean. Theprobabilitythat a child is within the normalrangeof long growth is