Answer:
13/50
Step-by-step explanation:
#of original states/# of states now
Answer:
The Number is -8.
Step-by-step explanation:
Let the number be x.
Now given:
A number decreased by twelve;
It means 12 is subtracted from the number.
Hence the equation can be framed as;
Also given;
twice the opposite of ten
Opposite of 10 = -10
Twice the opposite of 10 means 2 is multiplied with opposite of 10.
Hence twice the opposite of ten =
Now A number decreased by twelve is twice the opposite of ten
framing it in equation form we get;
Solving the above equation we get;
Hence the Number is -8.
Step-by-step explanation:
f(5) = 2(5 - 7) = 2(-2) = -4.
Answer:
The test is left - tailed
We cannot reject the organization's claim ( its cheapest screens will truly last less than 2.8 years)
Step-by-step explanation:
Sample size, n = 61
Sample mean,
Standard deviation,
Significance level, α=0.02
Null hypothesis,
Alternative hypothesis,
It is clearly seen from the alternative hypothesis, that it is a left tailed test. It is not tailed towards the two directions.
Calculate the test statistic:
Calculate the P-value:
P(Z < -3.35) = 0.0002
Since (p-value = 0.0002) < (α=0.02), the null hypothesis is rejected.
It can therefore be concluded that the mean of the cheapest screen is less than 2.8 years. i.e. the cheapest screen will last less than 2.8 years