Answer:
3
Step-by-step explanation:
Answer:
Step-by-step explanation:
From the information given:
mean life span of a brand of automobile = 35,000
standard deviation of a brand of automobile = 2250 miles.
the z-score that corresponds to each life span are as follows.
the standard z- score formula is:

For x = 34000


z = −0.4444
For x = 37000


z = 0.8889
For x = 3000


z = -2.222
From the above z- score that corresponds to their life span; it is glaring that the tire with the life span 30,000 miles has an unusually short life span.
For x = 30,500


z = -2
P(z) = P(-2)
Using excel function (=NORMDIST -2)
P(z) = 0.022750132
P(z) = 2.28th percentile
For x = 37250


z = 1
Using excel function (=NORMDIST 1)
P(z) = 0.841344746
P(z) = 84.14th percentile
For x = 35000


z = 0
Using excel function (=NORMDIST 0)
P(z) = 0.5
P(z) = 50th percentile
Answer:
x={-5,-6}
Step-by-step explanation:
x²+11x+30=0
x²+5x+6x+30=0 (as 5*6=30 and 5+6=11)
x(x+5)+6(x+5)=0
(x+5)(x+6)=0
so
x+5=0
x+6=0
therefore
x=-5
x=-6
Cant see the graph so I cant help
Aneesha speed in feet/s.
50 miles/h*(5280 feet /1mile)*(1h/3600 s)=73.33 feet/s
speed (Morris)=speed (Aneesha)-3 feet/s
speed (Morrris)=73.33 feet/s-3 feet/s=70.33 feet/s.
Speed Morris=70.33 feet/s.