The Mental Development Index (MDI) of the Bayley Scales of Infant Development is a standardized measure used
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The Mental Development Index (MDI) of the Bayley Scales of Infant Development is a standardized measure used in studies with high-risk infants. It has approximately a normal distribution with a mean of 100 and a standard deviation of 16.
(a) What proportion of children have an MDI of at least 120?
(b) Find the MDI score that is the 90th percentile.
(c) Find and interpret the lower quartile, median, and upper quartile.
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