angelinaavila06
25.06.2019 •
Mathematics
Light bulbs of a certain type are advertised as having an averagelifetime of 750 hours. the price of these bulbs is very favorable,so a potential customer has decided to go ahead with a purchasearrangement unless it can be conclusively demonstrated thatthe true average lifetime is smaller than what is advertised. arandom sample of 50 bulbs was selected, the lifetime of each bulbdetermined, and the appropriate hypothesis were tested usingminitab, resulting in the accompanying output.variable n mean st dev semean zp -valuelifetime 50 738.44 38.20 5.40-2.14 0.016 what conclusion would be appropriate for a significance level of.05 ? .a significance level of .01 ? . what significance level wouldyou recommend ?
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Ответ:
answer 40
Step-by-step explanation:
because you added all together to make one
Ответ:
Step-by-step explanation:
Two years ago: (r-2)= 3(c-2) , r= 3c-4 … eqn1.
After 3 years: (r +3) = 2(c+3), r= 2c+3 …. eqn2.
Substracting eqn2 from eqn2: 0 = c-7, c= 7.
From eqn2, r= 3c-4=17.
Rita is 17 years old now & Cheryl is 7 years old now