[SenChe CodO]

1- A BOX CONTAINS 3 RED BALLS AND 5 BLAK BALLS ARE SELECTED WITH REPLACEMENT . THE stander DEVIATION OF THE NUMBER OF RED BALLS THAT BE OBTAINED ?



a-0.968


b-0.938

c-5
d-4


2-A die is rolled 5 times . the probability of getting a number 4 one time only is

a-0.167 b-0.386 c-0.402 d-0.015


male - female
3- 200 ---- 300 -------------- bachelor

15 ----- 35 ---------- masters



?is a female given that the person earned bachelor degree

a-0.6 b-0.36 c-0.4 d-0.67

?earned masters degree or is female

a0.45 b-0.48 c- 0.7 d 0.67





4- committee of 4 people is be formed 6 doctors and 8 engineers . find the probability that the committee will consist of at least tow doctor

a-0.17 b- 0.41 c-0.59 d-0.83

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