Question

Find the z-score when n = 1003, x = 552, p = 50%.

a. z = +3.19 b. z = +5.0 c. z = −3.19 d. z = −5.0

Answer 1

Solution :

Given that,

p = 0.50

1 - p = 1 - 0.50 = 0.50

n = 1003

Using binomial distribution,

= n * p = 1003 * 0.50 = 501.5

= n * p * q = 1003 * 0.50 * 0.50 = 15.84

x = 552

Using z-score formula,

z = x - /

z = 552 - 501.5 / 15.84

z = 3.19

correct option is = a

answered by: anonymous