Na certain store, there is a .03 probability that the scanned price in the bar code scanner will not match the advertised price. the cashier scans 780 items.
(a) what is the expected number of mismatches? (round your answer to the nearest whole number.)
(b) what is the standard deviation? (use your rounded number for the expected number of mismatches for the calculation of standard deviation. round your final answer to 4 decimal places.)

Step-by-step explanation:

Given that in a  certain store, there is a .03 probability that the scanned price in the bar code scanner will not match the advertised price.

Here X the number of items that will not match in the sample of 780 items is binomial because

i) there are two outcomes only

ii) Also each trial is independent of the other.

a) the expected number of mismatches

b) Var(x) =

Std dev (X) = 4.7642

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column