Question

I need help quickly... Will give medal to best answer!
Let x be a binomial random variable with n = 15 and p = .5. Using the exact binomial calculation and the normal approximation with the continuity correction, find P(x > 6).

.3036, .3036

.849, .745

.6964, .6972

.6964, .745

.1527, .3036

Answer 1

@ganeshie8

Answer 2

the exact binomial, you can use the binomial formula

Answer 3

$$ \Large P(x \leq a)=\sum_{i=0}^{a} {n \choose i}p^i (1-p)^{n-i}$$

Answer 4

with me so far?

Answer 5

yes

Answer 6

and use the fact
$$ \Large P( x >a ) = 1 - P( x \leq a ) $$

Answer 7

ok thnxs, can u help me with som emore plz

Answer 8

ok

Answer 9

what did you get for this one?

Answer 10

I used my calculator:
for exact binomial:
1 - binomcdf( 15,.5, 5) = .69638

for the normal approximation :
normalcdf( 6.5, 1E99, 15*.5 , sqrt(15*.5*.5)) = .6972