Answer:
The mean run time is 300 minutes
Step-by-step explanation:
Null hypothesis: The mean run time is 300 minutes
Alternate hypothesis: The mean run time is not 300 minutes
Test statistic (z) = (sample mean - population mean) ÷ sd/√n
sample mean = 295 minutes, population mean = 300 minutes, sd = 20 minutes, n = 50
z = (295 - 300) ÷ 20/√50 = -5 ÷ 2.83 = -1.77
The test is a two tailed test. The critical value using a significance level of 0.05 is 1.96
Since the test is two tailed, the region of no rejection of the null hypothesis lies between -1.96 and 1.96
The test statistic (-1.77) falls within the region bounded by -1.96 and 1.96, fail to reject the null hypothesis
Conclusion: The mean run time is 300 minutes
Answer:
9/10x3 1/3 =3 or 10/3x9/10 =3
Step-by-step explanation:
1. add 15 to -15 and 20. 5x=35. then divide 35 by 5 and get 7.
2. subtract 3 from 3 and -15. 9x= -18 x=-2
Answer:
the area of the trapezoid is 70 feet
Step-by-step explanation:
May I have brainliest please? :)