Answer:
29.37% probability that exactly five of the first nine sold have cracked screens
Step-by-step explanation:
A probability is the number of desired outcomes divided by the number of total outcomes.
The order in which the smartphones are chosen is not important. So we use the combinations formula to solve this question.
Combinations formula:
is the number of different combinations of x objects from a set of n elements, given by the following formula.
Desired outcomes:
5 with cracked screens, from a set of 7.
9-5 = 4 with good screens, from a set of 15-7 = 8.
So
Total outcomes:
Nine phones, from a set of 15. So
Probability:
29.37% probability that exactly five of the first nine sold have cracked screens
Answer:
8/38
Step-by-step explanation:
you calculate how many socks and then take how many the blue ones are
Answer:
It's the law of cosines
Step-by-step explanation:
law of cosines states that
so we know that a = 7, b = 4, and alpha would be 135 degrees, so just plugging it in gets us 49+16-2*7*4*(-0.707) = 65 + 39.59 = 104.59
4s*0.049+s*0.017=426
0.213s=426
s=2000
Person should invest 48000 at 4.9% interest rate
and invest $2000 at 1.7% interest rate
1.function: y= 1/12x + b
12 > 1
24 > 2