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belka [17]
2 years ago
10

Suppose a normal distribution has a mean of 62 and a standard deviation of

Mathematics
1 answer:
lutik1710 [3]2 years ago
7 0

Answer:

62.5%

Step-by-step explanation:

(56 - 62) / 4 = -1.5 z score = 0.0668

(64 - 62) / 4 = 0.5 z score = 0.6915

0.6915 - 0.0668 = 0.6247

Rounded this becomes 62.5%

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A local company wants to evaluate their quality of service by surveying their customers.
stich3 [128]

Answer: b. 0.98

Step-by-step explanation:

The formula to find the maximum error of the estimated mean :

E=z^*\dfrac{\sigma}{\sqrt{n}}            (1)

, where \sigma = standard deviation

n= Sample size

z* = Critical z-value.

As per given , we have

\sigma=5

n=100

Critical value for 95% confidence interval = z*=1.96

Put these values in the formula (1), we get

E=(1.96)\dfrac{5}{\sqrt{100}}

E=(1.96)\dfrac{5}{10}=0.98

Hence, the maximum error of the estimated mean quality for a 95% level of confidence is 0.98.

Therefore , the correct answer is b. 0.98 .

6 0
3 years ago
Read 2 more answers
(10x – 3 + 7x2) + (x3 – 2x + 17)
igor_vitrenko [27]

Answer:

Step-by-step explanation:

4 0
3 years ago
The question is: find 55% of $4.80...how do I find the answer?
tresset_1 [31]
4.80 = 100%
   x   = 55%

Cross Multiply

100 * x = 55 * 4.80
100x = 264
x = <u>264</u>
      100
x = 2.64

Solution: $2.64
6 0
3 years ago
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Find the area of the shape shown below.
cricket20 [7]

Answer:

18

Step-by-step explanation:

3+9=12

12/2=6

6x3=18

3 0
3 years ago
Read 2 more answers
Solve 2 (x + 4) - 10 = 14 step by step
Blababa [14]

Answer:

x=8

Step-by-step explanation:

2(x+4) - 10 =14

distribute the 2       2x +8 -10 +14

simplify                     2x-2=14

add 2                        2x=16

devide by 2               x=8

3 0
3 years ago
Read 2 more answers
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