Answer:
4.924 years
Step-by-step explanation:
Lets denote X the lifetime of a tv tube (In years). X has distribution 
, with 
unknown.
We know that P(X < 4) = 0.2. Using this data, we can find the value of throught standarization.
Lets call 
the standarization of X. Z has distribution N(0,1), and its cummulative function, 
is tabulated. The values of can be found in the attached file.
The value q such that 
doesnt appear on the table. We can find it by using the symmetry of the normal density function. The opposite of q, -q must verify that 
, hence -q must be equal to 0.84. Thus, q = -0.84
But this value of q should match with the number 
, so we have
Thus, the expected lifetime of TV tubes is 4.924 years.
I hope this works for you!
The slope of the line through (1,0) and (3,8) is 4
Answer:
k = 3
Step-by-step explanation:
The slope-intercept equation of a str. line is y = mx + b.
In this particular case, m = 12, so we have y = 12x + b
Comparing this to the given y = 4kx + b
we see that 12 must = 4k, and thus k = 3
Answer:
Answer (B) and answer (D) apply
Step-By-Step explanation:
You can take the x and y values of the points and use them on the opposite axis, depending on how many times you would have to use them on the opposite axis you can determine how much rotation is needed (Every time you use the points on the opposite axis it is equivalent to 90 degrees).
Answer:
Mrs. Schnuda can seal 70 boxes.
Step-by-step explanation:
She has 3 rolls of tape, 35 meters each. We multiply to find how many meters she has in total.
3 X 35 = 105
We then divide 1.5 from 105, since that's how much she'll use for each box.
105 ÷ 1.5 = 70
70 boxes in total.
