Hello everyone please need your help for this exercice

1536 .nl so Exercise 2. A survey of 1.000 households is carried out on the number of children and the annual expenditure on school supplies. We note: - either X the statistical variable associated with the character "number of children". - or Y the statistical variable associated with the character "annual expenditure on school supplies (in tens of euros)". The results are given by the following contingency table : \\fxv duller! ileum demtstl deitlittltl \"a. 1. Calculate the means, variances and standard deviations of the marginal distributions of X and Y. 2. Calculate the means. variances and conditional standard deviations of Y knowing X. Calculate the average ol the conditional means of Y. What can 1you do with it? conclude 'F' 3. Study the linear independence between the number of children and the annual expenditure on school supplies. What would be the annual expenditure of school supplies for a household with 4 children