Answer:
0.8041
Step-by-step explanation:
We know that
μ=72 and σ=5
and P(65<X<78)
We can determine the Z value as (X-μ)/σ
P( 65<X<78 )=P( 65-72< X-μ<78-72)


To fine the Z values:

From the standard normal tables:

to find P ( Z<-1.4)

From the standard normal tables:

Therefore


Answer:
Stephen: £36
Nick: £36
Brian: £18
Step-by-step explanation:
2+2+1= 5
90/5= 18
18x2= 36
18x2=36
18x1=18
Hope it helps
Answer:
31/6
Step-by-step explanation:
I got it right on my quiz
<span>No simplification exists, Root remains :
</span>sqrt(15y)