Jenna has 8 pairs of jeans. Three of them are blue.Jenna bought two more pairs of jeans. If both of them are blue, what percenta
1 answer:
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Answer: -1.51
Step-by-step explanation:
Let be the population mean rating of car.
As per given , we have
Since population variance is known, so we use z-test.
Test statistic :
, where n= sample size
= Sample mean
= variance
As per given ,
n=300
Put these values in formula we get
Hence, the value of the test statistic is z= -1.51 .