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drek231 [11]
3 years ago
5

What’s the unit rate for 400 in 8 hours? Please help.

Mathematics
1 answer:
laila [671]3 years ago
7 0
I think the answer is: 1/50
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The class average on a math test was an 82 with a standard deviation of 5. If the 
Alex787 [66]

Answer:

Option 3 and 4.

Step-by-step explanation:

The z score shows by how many standard deviations the raw score is above or below the mean. The z score is given by:

z=\frac{x-\mu}{\sigma} \\\\where\ x=raw\ score,\mu=mean, \ \sigma=standard\ deviation

Given that mean (μ) = 82, standard deviation (σ) = 5

1) For x = 74:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{74-82}{5} =-1.6

Option 1 is incorrect

2) For x < 87

z=\frac{x-\mu}{\sigma} \\\\z=\frac{87-82}{5} =1

From the normal distribution table, P(x < 87) = P(z < 1) = 0.8413 = 84.13%

Option 2 is incorrect

3) For x = 95:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{95-82}{5} =2.6

Option 3 is correct

4) For x < 77

z=\frac{x-\mu}{\sigma} \\\\z=\frac{77-82}{5} =-1

From the normal distribution table, P(x < 77) = P(z < -1) = 0.16 = 16%

Option 4 is correct

5) For x > 92

z=\frac{x-\mu}{\sigma} \\\\z=\frac{92-82}{5} =2

From the normal distribution table, P(x > 92) = P(z > 2) = 1 - P(z < -2) = 1 - 0.9772 = 0.0228 = 2.28%

Option 5 is incorrect

8 0
2 years ago
A coin is tossed seven times and the sequence of heads and tails is observed. what is the number of different outcomes having ex
Margaret [11]
You could make a tree diagram
                  H                          T                               ← 1st toss

           H           T               H          T                       ← 2nd toss

     H       T    H      T       H     T    H    T                   ← 3rd toss
etc ,,, then count the combination of favorable outcomes

Using a calculator:
Total number of outcomes is 2^{7} = 128
Probability of getting exactly 3 heads is found using the follow calculator feature: binompdf(7, 0.5, 3) 

ANSWER: Typed into the calculator as follows binompdf(7,0.5,3)×128 = 35



7 0
3 years ago
A post it note has an area of A square inches. The width of the post it note is 4 inches.which equation represents X the length
SVEN [57.7K]

Answer:

Option C. X=A/4

Step-by-step explanation:

we know that

The area of the rectangular post it note is equal to

A=LW

where

L is the length

W is the width

In this problem we have

W=4\ in

L=X\ in

substitute

A=4X

solve for x

That means ----> isolate the variable x

Divide by 4 both sides

X=\frac{A}{4}

6 0
3 years ago
One month Dante rented 2 movies and 3 video games for a total of$22 . The next month he rented 4 movies and 8 video games for a
lys-0071 [83]

Answer:

your answer is in above pic

5 0
2 years ago
Read 2 more answers
one digit from the number 9,484,558 is written on each of seven cards. what is the probability of drawing a card that shows 5?
Diano4ka-milaya [45]
Possibility or highly chances are that the five is going to get pulled because there are two of the fives and five isn't rare, so from the number 9,484,558 the number that would possibly be picked is one of the fives because there are two of the fives and five isn't rare if there is two of them, so the digit that would probably be pulled is one of the fives
4 0
3 years ago
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