40 = n x 11; 23.4 % this is wat i got
9514 1404 393
Answer:
sec(A) = -(1/5)√74
Step-by-step explanation:
Solving the equation for y, we have ...
-7x = 5y
-7/5x = y
The slope of this line (-7/5) is the tangent of the angle (A) it makes with the x-axis. The secant satisfies the relation ...
sec(A)^2 = 1 + tan(A)^2
sec(A) = √(1 +tan(A)^2)
sec(A) = -√(1 +(-7/5)^2) = -√(74/25) . . . . secant is negative in 2nd quadrant
sec(A) = -(1/5)√74
Answer:
7 or 8
Step-by-step explanation:
This situation can be modeled with the Binomial Distribution which give the probability of an event that occurs exactly k times out of n, and is given by
where
= combination of n elements taken k at a time.
<em>p = probability that the event (“success”) occurs once
</em>
<em>q = 1-p
</em>
In this case, the event “success” is wanting a new copy of the book with probability 25% = 0.25 and n=30 students randomly chosen.
The expected value for a binomial distribution is the mean np, so in this case the expected value of the number of students who want a new copy of the book would be
np = 30*0.25 = 7.5
<em>To make sense of this value, we could say that 7 or 8 students out of 30 want a new copy of the book.
</em>