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An unbiased coin is tossed 4 times. Find the mean and variance of the number of heads obtained.
Given:
n=4
p(getting atleast one head)=?
• 0 head : HHHH
• 1 head : HTTT
THTT
TTHT
TTTH
• 2 heads :HHTT
HTHT
HTTH
THHT
THTH
TTHH
• 3 heads: HHHT
HHTH
HTHH
THHH
• 4 heads : HHHH
Total outcomes = 16
Outcomes containing at least 1 head = 15
P(getting at least 1 head)=