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kenny6666 [7]
3 years ago
7

PLS HELP. It’s question 18

Mathematics
2 answers:
Gnom [1K]3 years ago
8 0

Answer:

no

Step-by-step explanation:

Anarel [89]3 years ago
4 0
No because figure b is much bigger and has a steeper angle at the top
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How can i converted 4 7/10 to an improper fraction
BartSMP [9]
The whole number multiply by the denominator and add to the numerator.

4\dfrac{7}{10}=\dfrac{4\cdot10+7}{10}=\dfrac{40+7}{10}=\dfrac{47}{10}
6 0
3 years ago
The life times of light bulbs produced by a particular manufacturer have a mean of 1,200 hours and a standard deviation of 400 h
Nezavi [6.7K]

Answer:

a. 1200hours

b.  σ² = 400² =160000hour

c. standard error = 133.33

d. for 9 lightbulb it is likely that 9*0.146 = 1.31 bulbs will have lives of fewer than 1,050 hours?

Step-by-step explanation:

mean of 1,200 hours

σ, a standard deviation of 400 hours.

Sample size, N =  nine bulbs,

a) mean of the sample mean lifetime: is given as 1,200 hours

b) variance of the sample mean is the square of the  σ, a standard deviation of 400 hours.

σ² = 400² =160000hours

c) What is the standard error of the sample mean?

The standard deviation of a sampling distribution of mean values is called the standard error of the means,

standard error of the means,  σx = σ √N

The formula for the standard error of the means is true for all values infinite number of sample, N.

σx = σ √N

     =400  √9 = 400/3 =133.3333

d) the probability that, on average, those nine lightbulbs have lives of fewer than 1,050 hours

The area under part of a normal probability curve is  directly proportional to probability and the value is calculated as

z = ( x₁−x) /σ

where z = propability of normal curve

x₁ = variate mean = 1050hours

x = mean of 1200hours

σ = standard deviation = 400

applying the formula,

z= (1050-1200)/400

z = 150/400 =0.375

Using a table of partial areas beneath the standardized normal curve (see Table of normal curve, a z-value of 0.375 corresponds to an area of 0.1460 between the mean value.

Thus the probability of a lightbulbs having lives of fewer than 1,050 hours is 0.1460.

for 9 lightbulb it is likely that 9*0.146 i.e. 1.31 bulbs will have lives of fewer than 1,050 hours?  

8 0
3 years ago
WILL MARK BRAINLIST the answer is not 21.5​
vaieri [72.5K]
Answer: 137... well i think because 180-43= to 137.
8 0
3 years ago
Which of the following decimals is equivalent to three and ten hundredths
Montano1993 [528]

Answer: 3.1 or 3.10

Step-by-step explanation:

3 and 10 hundredths = 3 + 10/100 = 3 + 0.10

3.10 / 3.1

6 0
2 years ago
Solve for ttt.<br> 2(t+1) = 102(t+1)=10
densk [106]

Answer:

2(t+1) = 102(t+1)=10

distribuite 2t+2=10

-8 2t=8

t=4

5 0
2 years ago
Read 2 more answers
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