Wht questions ?? i don’t understand what ur askin
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:
12 discs
Step-by-step explanation:
Sheet metal has dimensions of 56 cm by 33 cm. This indicates that it is a rectangle.
A_rectangle = length × width
A_rect = 56 × 33
A_rect = 1848 cm²
It is now melt down and recast into disc's of 7 cm radius and similar thickness.
Thus;
Area of one disc = πr² = π × 7² = 49π
Thus,number of disc's cast = 1848/49π
number of disc's cast = 12
Think about thus; how many yards in are 1 mile? 1760. Thus, since we have 4 miles we multiple 1760 by 4. 7040. There are 7040 yards in 4 miles. :)
$19,802.5 I hope this helps and I'm sorry I didn't reply sooner.