6>2k+4
2>2k
1>k
k has to be less than 1
Answer: a) k=0
Hope this helps:)
<span>√4
---
</span><span>√10
</span>
√4 * √10
= ---------------
√10 * √10
2 √10
= ----------
10
√10
= ----------
5
The z-score for 36,000 is (36,000 - 40,000) / (15,000 / √25) = -1.333
The z-score for 42,000 is (42,000 - 40,000) / (15,000 / √25) = 0.6667
P(36,000 < x < 42,000) = P(-1.3333 < z < 0.6667)
P(z < 0.6667) - P(z < -1.3333)
0.7475 - 0.0913
0.6562
