3.7 It is of interest to study sentiment of people toward racially integrated neighborhoods. Let X1 denote time an individual has lived in a given neighborhood; X2 denotes his feelings toward an integrated neighborhood (measured on a 100 point scale from–50 to +50, with the extremes implying least or greatest satisfaction with integration); X3 denotes number of years of education of the individual. Many observations are taken in a given neighborhood so the means, variances, and covariances may be assumed to be known. Suppose X’ ≡ (X1,X2,X3), and where Find the distribution of: X1, for given X2 and X3, (X1,X2) for given X3, X3, for given X1 and X2.