The scores of eighth-grade students in a math test are normally distributed with a mean of 57.5 and a standard deviation of 6.5.
2 answers:
As given, the scores of eighth-grade students in a math test are normally distributed with a mean of 57.5 and a standard deviation of 6.5.
This means that around 68% of the distributed data lies within the ranges of -6.5 to +6.5 of the given standard deviation.
This implies to:
and
So, the range of scores lies between (51,64)
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Answer:
He can buy at least 34 pounds of fish.
Step-by-step explanation:
4x + 3x 240
7x 240
(240 divided by 7 gives you a decimal, so you would round it to the nearest whole number)
x 34
Answer:
a: The mean of 800 customers per day
b: See below
c: z = -1.43
d: 0.0764
e: Fail to reject the null
Step-by-step explanation:
b: The hypotheses are:
H0: µ = 800
HA: µ < 800 (claim)
The mean number of daily customers was 800. She feels the number of customers has decreased, so the alternate is mu is less than 800.
c: See attached photo for the calculation of the test statistic
d: The probability is on the z table. Find the decimal that corresponds to the z-value of -1.43, which is: 0.0764
e: Since 0.0764 > 0.05, we fail to reject the null hypothesis. There is not enough evidence to support the claim that the number of customers visiting the dealership has decreased.
