أي أحد عندوو سؤال في الاحصاء يتفضل ..

[GEN!US]

السلام عليكم

رجعت لكم بأسئلة ^^" معليش

If a coin is tossed 4 times, find the following (answer questions 19, 20 and 21)
19. The variance of the number of heads that will be obtained.
A) 4
B) 0.25
C) 2
D) 1
20. The probability of getting 4 heads.
A)
1
8
B)
1
4
C)
1
2
D)
1
16
21. The probability of getting 2 head..
A)
1
9
B)
1
8
C)
3
4
D)
3
8

34. If 3% of calculators are defective, find the standard deviation of the defectives in
300 calculators?
A) 2.95
B) 0.79
C) 8.73
D) 9

يا ليت واحد يحلها وما عاد اجي مره ثانيه ^^