Answer:
Step-by-step explanation:
−
1
/2
+
3
/4
(
4
/9
)
=−1
/2
+
3
/4
(
4
/9
)
=
−1
/2
+
1
/3
=
−1
/6
(Decimal: -0.166667)
Answer:
Step-by-step explanation:
Given that that (X) the amount of time lapsed between consecutive trades on the New York Stock Exchange followed a normal distribution with a mean of 15 seconds.
i.e. X is normal with mean = 15 and unknown std deviation 
Given that
i.e. P(
z=-1.475 (from normal table)
Hence 
Using this we find P(X>17) = 
The answer is 2023, so I would say 2000