Answer:
81.85%
Step-by-step explanation:
We have the following information:
mean = m = 52000
standard deviation = sd = 12000
a = 40000
b = 76000
we need to find the probability between a and b, that is:
P (a <x <b) = P (40,000 <x <76000)
P [(40000 - m) / sd <(x - m) / sd <(76000 - m) / sd]
replacing
P [(40000 - 52000) / 12000 <z <(76000 - 52000) / 12000]
P (-1 <z <2)
P (z <= -1) - P (z <= 2)
We look for this value of z, in the attached table:
0.9772 - 0.1587
P = 0.8185
In other words, the probability is 81.85%
After 12 years
3500 * 2 = 7000
after 24 years
7000 * 2 = 14000
14000 : 3500 = 4
so the answer is 24 years
Step-by-step explanation:
-6 = 2/9 x
2/9x = -6
x = (-6)×9/2
= -27
Answer:
<h3>formulas</h3>
<em><u>frequency</u></em><em><u>=</u></em><em><u>spee</u></em><em><u>d</u></em><em><u>/</u></em><em><u>wavele</u></em><em><u>ngth</u></em>
<em><u>f</u></em><em><u>=</u></em><em><u>2</u></em><em><u>5</u></em><em><u>0</u></em><em><u>/</u></em><em><u>5</u></em><em><u>0</u></em>
<em><u>f</u></em><em><u>=</u></em><em><u>5</u></em><em><u>0</u></em><em><u>h</u></em><em><u>z</u></em>
D/20=20/15
d=400/15
d=80/3
d=26 2/3 miles