sally has scores of 88, 92, 80, and 96. find the score she must make on the next exam to have an average of 90
1 answer:
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Answer: Option 'c' is correct.
Step-by-step explanation:
Since we have given that
n = 240
mean = 22.3 hours
standard deviation = 6 hours
At 99% level of confidence, z = 2.58
So, interval would be
Hence, Option 'c' is correct.
Answer:
std dev = 0.625
Step-by-step explanation:
Given that weights of bags of potato chips coming from a factory follow a normal distribution with mean 12.8 ounces and standard deviation .6 ounces.
We must change std deviation such that
P(X<12) =0.01
Mean would remain the same as 12.8 oz
From normal distribution score we can find
10th percentile is -1.28\
i.e. we must have
Std deviation should be 0.625
Answer:
Step-by-step explanation:
can stay untouched, but
has to be changed to
. Now that they have they have the same denominator, you can add them.
, which can be simplified, which is
.