Question

the following table gives the number of camcorders sold on a given day in an electronics store
X: 0, 1, 2, 3, 4, 5, 5,
P(x) 0.5, .12, .23, .3, .16, .1, .04
find the mean, variance, and standard deviation of the daily sales of camcorders in the store.

Answer 1

Mean = 0(.5) + 1(.12) + 2( .23) + 3(.3) + 46.16) + 5(.1) +5 (.04) = ?
variance = 0^2(.5) + 1^2(.12) + 2^2 (.23) + 3^2(.3) + 4^2(.16) +5^2 (.1) + 5^2(.04) = ?

Standard deviation = sqrt(variance -mean ^2))

Answer 2

3,96