Answer:
Step-by-step explanation:
Given that the random variable X is normally distributed, with
mean = 50 and standard deviation = 7.
Then we have z= 
Using this and normal table we find that
a) 
b) When z=0.02
we get
c) 90th percentile z value =1.645
90th percentile of X 
Answer:
Adding by 4 each time
Step-by-step explanation:
x = 1/120
i did not see the comment about the 1/5 until now
hope this helps
4/5 x 1 1/6
<span>= 4/5 x (6 x 1 + 1)/6 </span>
<span>= 4/5 x 7/6 </span>
<span>= (4 x 7)/(5 x 6) </span>
<span>= 28/30 </span>
<span>= (28 ÷ 2)/(30 ÷ 2) </span>
<span>= 14/15</span>
