Answer:
P(X is less than 348) = 0.2148
Step-by-step explanation:
Given that:
Sample proportion (p) = 0.3
Sample size = 1200
Let X be the random variable that obeys a binomial distribution. Then;
The Binomial can be approximated to normal with:
To find:
P(X< 348)
So far we are approximating a discrete Binomial distribution using the continuous normal distribution. 348 lies between 347.5 and 348.5
Normal distribution:
x = 347.5, 
= 360, 
= 15.875
Using the z test statistics;
z = -0.7874
z ≅ - 0.79
The p-value for P(X<347.5) = P(Z < -0.79)
From the z tables;
P(X<347.5) = 0.2148
Thus;
P(X is less than 348) = 0.2148
Discriminant = sq root of b^2 - 4*a*c =
sq root of 36 - 4*1*13 =
sq root 36 -52 =
sq root 36 -52 =
sq root -16
There are no real solutions for this equation. Both roots are complex numbers.
-884/70
(-884/2)/(70/2) (divide top & bottom by two)
-442/35
*check - bottom can only be divided by 1, 5, and 7.
*1 won't change anything.
*top obviously cannot be divided by 5.
*check if top can be divided by 7.
7*60 = 420
442 - 420 = 22
22 is not divisible by 7.
Therefore, 442 is not divisible by 7.
*Therefore, -442/35 is simplest form.
Answer:
the correct answer is a.2.5
Step-by-step explanation:
15=2(a+5) || 15=29+10 || 15-10=2a || 5=2a || 2.5=a
[A+7= 28] is the correct equation I believe, though I may be wrong.
