The Mental Development Index (MDI) of the Bayley Scales of Infant Development is the standardized measure employed in longitudinal follow-up of high-risk infants. The scores on MDI have approximately the normal distribution with the mean of 100 and standard deviation of 25. What proportion of children have MDI of at least 90?
Select one:
A) .3446
B) .6554a
C) .0062
D) .9938