Answer:
P ( x_bar > 335 ) = 0.9826
Step-by-step explanation:
Given:
- Mean amount u = 350
- standard deviation s.d = 45/year
- Sample size n = 40
Find:
- The probability of sample mean P( x_bar > 335 )
Solution:
- P ( x_bar > 335 ) = P ( Z > sqrt(n)*(x_bar - u)/s.d)
= P ( Z > sqrt(40)*(335-350)/45)
= P ( Z > -2.111) = P ( Z < 2.111)
= 0.5 + P( 0 < Z < 2.111)
= 0.5 + 0.4826
= 0.9826
Answer:
1200 in³
Step-by-step explanation:
V= l×w×h
they gave you l×w which is 200.
200×6= 1200
Answer:
The answer is 144 grams of zinc
Step-by-step explanation:
proportion zinc to copper = 4/17
4/17 = z/ 612
multiply the extremes
17 . z = 4 . 612
17 . z = 2,448
z = 2,448 / 17
z = 144
The answer is 144 grams of zinc
Always check your answer
4/ 17 = 144/612 = 0.235
For this one, use the order of operations to solve it, we called it PERMDAS to remember the steps.
14-6.2 times (-3+ -7)
So do the parenthesis first
-3+-7= -10
now the multiplication
-6.2 times -10= 62
a negative times a negative equal a 62
Now your problem is 14-62
Which equals -48.
So if I did my math and operations correctly, the answer would be B. -48.
Hope this helps!
