Prolog Average and Standard Deviation

Signature of methods

• average(X): Returns to X the average of all the exams in the KB.

• average(X,Y): Returns to Y the average of the list of exams in X.

• dev(Y): Returns to Y the standard deviation of all the exams in the KB.

• dev(X,Y): Return to Y the standard deviation of the list of exams in X.

Examples

exam(geometria,23),
exam(fondamenti_inf_1,29),
exam(calc_delle_prob,21),
exam(analisi_mat_1,25),
exam(fisica,26),
exam(calc_elettronici,26),
exam(analisi_mat_2,24),
exam(controlli_autom,29),
exam(teoria_dei_sitemi,24),
exam(reti_di_calcolatori,25),
exam(fondamenti_inf_2,24),
exam(sistemi_operativi,28),
exam(basi_di_dati,25),
exam(telecomunicazioni,20),
exam(ricerca_operativa,22),
exam(contr_gest_reti,28),
exam(complementi_fisica,19)

Average

?- average(Y).

	Y = 24.588235294117645.

Standard deviation

?- adev(Y).

	Y = 2.8913425241045894.