Step-by-step explanation:
OA=AC=OC=2 (equal triangle)
which means angle O =60 degree
tan 60 = AB / 2
AB = 2 tan 60 =
To go on the class trip, chang needs at least $125. he has saved $45, and he makes $7 an hour at his job. what is the minimum nu
2 answers:
You might be interested in
B. The total area painted is 864; they must buy two cans of paint.
Step-by-step explanation:
Step 1:
A rectangle's area can be calculated by multiplying its length and its width. The wall is made up of 5 different types of rectangular walls. All walls are 8 feet tall but the length varies.
Step 2:
The area of the 20 feet long wall =
The area of the 10 feet long wall =
The area of the 5 feet long wall =
The area of the 4 feet long wall =
The area of the 15 feet long wall =
The area of all the walls = 432 square feet.
Since there are two sides for every wall, total area = square feet.
Step 3:
If one paint can covers 500 square feet,
the number of cans required to paint 864 square feet = cans.
so 2 paint cans are needed to paint 864 square feet which is option B.
Answer:
a) 98% confidence interval for the true mean checking account balance for local customers.
(453.586 , 874.693)
b) 95% confidence interval for the standard deviation.
(214.91 , 441.53)
Step-by-step explanation:
Given a size of sample 'n' =14
given mean of the sample x⁻ = $664.14
standard deviation of the sample 'S' = $297.29.
a)
<u>98% of confidence intervals</u>
<u></u><u></u>
The degrees of freedom γ=n-1 =14-1 =13
t₁₃ = 2.650 at 98% of confidence level of signification.
on calculation, we get
(664.14-210.553 , 664.14+210.553)
(453.586 , 874.693)
98% confidence interval for the true mean checking account balance for local customers.
(453.586 , 874.693)
<u>95% of confidence intervals</u>
The degrees of freedom γ=n-1 =14-1 =13
X^2_{0.05,13} =22.36 (check table)
X^2_{0.95,13} = 5.892 (check table)
(214.91 , 441.53)
95% confidence interval for the standard deviation.
(214.91 , 441.53)
