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Inessa [10]
3 years ago
13

A number is 3 tens more than 249. What is the number?

Mathematics
2 answers:
sweet-ann [11.9K]3 years ago
5 0
279 I think because 4+3=7 and 3 = the tenths your adding
Masteriza [31]3 years ago
4 0
Idk is it 279?? tell me if am wrong plzz
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A new medical test has been designed to detect the presence of the mysterious brainlesserian disease. among those who have the d
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A "The person has the disease"
B "The test is positive", C "the test is erroneous"
Our formula will be then:
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So the probability we are looking for is 0.19
8 0
4 years ago
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Answer:

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6 0
3 years ago
4.Cost of 10 book is ₹800.What is the cost of 50 such books
eimsori [14]

Answer:

<u>₹4000</u>

Step-by-step explanation:

₹800/10 books

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3 0
3 years ago
A scientist studying water quality measures the lead level in parts per billion (ppb) at each of 49 randomly chosen locations al
NeX [460]

Complete Question

The complete qustion is shown on the first uploaded image

Answer:

The correct option is B

Step-by-step explanation:

From the question we are told that

      The sample size  is  n = 49

       The mean is  \mu  =  17ppb

       The standard deviation is \sigma =  14 ppb

Generally the standard error of this measurement is mathematically represented as

       \sigma_z  =  \frac{\sigma}{\sqrt{n} }      

substituting values

      \sigma_{\= x}  =  \frac{14}{\sqrt{49} }  

     \sigma_{\= x}  =  2ppb

Now the probability that the mean lead level from the sample of 49 measurements T is less than 15 ppb represented as P(X < 15 )

Next is to find the z value

    z =  \frac{\mu -\sigma }{\sigma_{\= x}}

     z =  \frac{15-17}{2}

      z =  -1

Now checking the z-table for the z-score of  -1 we have  

      P(X

                       

       

     

5 0
4 years ago
Write a word phrase to represent the numerical expression below. 4+ (27 -10)
Sliva [168]
4 + (27 - 10)

4 increased by the difference of 27 and 10
6 0
4 years ago
Read 2 more answers
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