Answer:
P = 95%
Step-by-step explanation:
The average is:
The standard deviation is:
.
We want the probability that the red light lasts between 2.5 minutes and 3.5 minutes
This is:
Now we must transform these values to those of a standard normal distribution to facilitate calculation by using the probability tables.
This is:
---------- (By the symmetry of the standard normal distribution)
When you search for the normal standard table, you get the following value:
2ten 11ines=21
Hope that helps
Answer: 1 1/6
Step-by-step explanation:
Let the amount of students that a bottle of juice can cater for be x. Therefore,
2/3 × x = 12
2x/3= 12
2x = 12 × 3
2x = 36
x = 36/2
x = 18
Since Mrs. Williams gave juice to 21 students, the number of bottles of juice that was used will be:
= 21/18
= 1 3/18
= 1 1/6
Answer:
pradis has more orange slices
reason:The ratio of apple slices to the total number of slices on Praxis plate is 4 to 11. This means for every 11 slices in Praxis plate, 4 of them are apple slices and 7 of them are orange slices. This also shows the total number of slices in Praxis plate is a multiple of 11.
First possibility of total number of slices in Praxis plate is 11. Another possibility of total number of slices in Praxis plate is 11 x 2 = 22. Since, it is given that total number of slices are not more than 20, so 22 slices are not possible in Praxis plate. So, the only possibility is 11 slices. From here we can conclude that: Number of slices in Pam Plate:
The ratio of the total number of slices to orange slices on Pam plate is 13 to 6. This means for every 13 slices in Pam's plate there are 6 orange slices and 7 apple slices. This also show the total number of slices in Pam's plate is a multiple of 13.
The first possibility of total number of slices in Pam's plate is 13. The next possibility is 13 x 2 = 26 slices. But since the number of slices cannot be above 20, the only possibility is that there are 13 slices in Pam's plate. From here we can conclude that:
