Page 48 - Math SL HB Sem 3
P. 48

Statistics  And Probabiliry


                     Example:
                     A random variable X has probabili!  densit-v  iunction (p-d-f) as shown.Find  rhe

                     x               -2      r0t2
                     P[x = r)        0-3 0.1 0_15        0.1  0.05















                    Example:
                    A discrete randorn variable Z has thc follorving  probabiliS  distribution:

                    Z              I      2    t
                    P(Z:zl         0.1    0.2  0.7
                    Find the value oft if E(4: 4.
















                    Iixamplc:
                    A discretc randonr  variable can onl-v take the values 2 and J, and has expectalion
                    2.6-Find  ihe probabiliries  p(X  - 2) and  p(X  =3)





































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