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soldier1979 [14.2K]
3 years ago
8

Noni is looking for the sum of a number, n, and 21. What is the sum Noni is looking for if n=8

Mathematics
2 answers:
krek1111 [17]3 years ago
5 0
Sum of a number, n and 21...." the sum " means add
n + 21

if n = 8
8 + 21 = 29....the sum is 29
marysya [2.9K]3 years ago
4 0

Answer:

the answer is 29

Step-by-step explanation:

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100

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PLS HELP ASAP WILL GIVE YOU BRAINLIEST
lbvjy [14]

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3 years ago
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In a process that manufactures bearings, 90% of the bearings meet a thickness specification. A shipment contains 500 bearings. A
vredina [299]

Answer:

c) P(270≤x≤280)=0.572

d) P(x=280)=0.091

Step-by-step explanation:

The population of bearings have a proportion p=0.90 of satisfactory thickness.

The shipments will be treated as random samples, of size n=500, taken out of the population of bearings.

As the sample size is big, we will model the amount of satisfactory bearings per shipment as a normally distributed variable (if the sample was small, a binomial distirbution would be more precise and appropiate).

The mean of this distribution will be:

\mu_s=np=500*0.90=450

The standard deviation will be:

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We can calculate the probability that a shipment is acceptable (at least 440 bearings meet the specification) calculating the z-score for X=440 and then the probability of this z-score:

z=(x-\mu_s)/\sigma_s=(440-450)/6.7=-10/6.7=-1.49\\\\P(z>-1.49)=0.932

Now, we have to create a new sampling distribution for the shipments. The size is n=300 and p=0.932.

The mean of this sampling distribution is:

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The standard deviation will be:

\sigma=\sqrt{np(1-p)}=\sqrt{300*0.932*0.068}=\sqrt{19}=4.36

c) The probability that between 270 and 280 out of 300 shipments are acceptable can be calculated with the z-score and using the continuity factor, as this is modeled as a continuos variable:

P(270\leq x\leq280)=P(269.5

d) The probability that 280 out of 300 shipments are acceptable can be calculated using again the continuity factor correction:

P(X=280)=P(279.5

8 0
3 years ago
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6 0
3 years ago
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WARRIOR [948]

Answer:

b.10 inches

Step-by-step explanation:

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