Probability of bulb malfunction

[tzx9633]

Homework Statement

consider 8 packs of bulb and let x be the number of bulbs in a pack that 'fail' the first time they are used . If 0.02 of all bulbs of this type fail on their first use and each 8-pack is consider random sample , what is the probability that anyone 8-pack has no bulb fail on the first use ?

Homework Equations

The Attempt at a Solution

I use binomial probability to solve this . But my ans didnt match the ans given
My ans :
(8c0)(0.02^0)(0.98^8) = 0.8507 , the ans given = 0.3012

 

[Ray Vickson]

Homework Statement

consider 8 packs of bulb and let x be the number of bulbs in a pack that 'fail' the first time they are used . If 0.02 of all bulbs of this type fail on their first use and each 8-pack is consider random sample , what is the probability that anyone 8-pack has no bulb fail on the first use ?

Homework Equations

The Attempt at a Solution

I use binomial probability to solve this . But my ans didnt match the ans given
My ans :
(8c0)(0.02^0)(0.98^8) = 0.8507 , the ans given = 0.3012

Your answer is correct; the "given" answer makes no sense at all in this problem.