Billy bought 59+45.87+131.39 how much did he spend .
2 answers:
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Answer:
The rate of jet in still air is 850 mile per hour
The rate of jetstream is 150 mile per hour.
Step-by-step explanation:
Given as :
The distance cover against jetstream = 5600 miles
The time taken against Jetstream = 8 hours
The distance cover with jetstream = 4000 miles
The time taken with the jetstream = 4 hours
Now , let The speed of jet in still air = x mph
The speed of jetstream = y mph
As , Speed =
So, According to question
x - y =
Or, x - y = 700 mph
x + y =
Or, x + y = 1000 mph
So, ( x - y ) + ( x + y ) = 700 + 1000
Or, 2 x = 1700
∴ x = = 850 mph
And y = 1000 - 850 = 150 mph
Hence The rate of jet in still air is 850 mile per hour and The rate of jetstream is 150 mile per hour. Answer
Answer: The critical value of the test is 2.807.
Step-by-step explanation:
Since we have given that
n = 24
So, the degree of freedom v = n-1 = 24 - 1=23
Since, n>30, so we will use 't-test'.
Here, α = 0.01
so, According to t-table, we get that
If we take α, then we are taking about two tail test.
If we take then we are talking about one tail test.
But in both the cases, the result will be same.
Hence, the critical value of the test is 2.807.