180/4=45mph
90/1.7=52.94ish
Ali drives faster
Answer:
x=-6
Step-by-step explanation:
since y varies directly with x
it means y=Kx, and k=y/x
when y=6, and x=-2
k=6/-2=-3
But when y=18, x will be given by
x=y/k
x=18/-3,. x=-6
Answer:42
Step-by-step explanation:
V= 18 + 6(4)
V= 18 + 24
V= 42
Answer:
4/12 chance that it will land on a higher number than 8
Step-by-step explanation:
Answer:
(A) T-stat = 1.82
(B) Critical value is 1.645
(C) Yes, there is sufficient evidence to reject the null hypothesis using a 0.05 significance level.
Step-by-step explanation:
(A) T-stat (z) = (sample mean - population mean) ÷ sd/√n
sample mean = 3850 bus miles
population mean = 3800 bus miles
sd = 275 bus miles
n = 100
z = (3850 - 3800) ÷ 275/√100 = 50 ÷ 275/10 = 50 ÷ 27.5 = 1.82
(B) The test is a one-tailed test. The critical value is obtained from the standard normal distribution table. The critical value using a 0.05 significance level is 1.645
(C) Null hypothesis: The bus mechanical reliability is 3850 bus miles.
Alternate hypothesis: The bus mechanical reliability is less than 3850 bus miles.
Conclusion:
There is sufficient evidence to reject the null hypothesis because the test statistic (1.82) is greater than the critical value (1.645)