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4 years ago

13

Suppose a brand of lightbulbs is normally distributed with a mean life of 1900 hours and a standard deviation of 50 hours. Find

the probability that a lightbulb will last between 1825 hours and 1980 hours

1 answer:

Alexxandr [17]4 years ago

6 0

I am not sure exactly how to do it but based on my knowledge, I think the answer would be 1/38

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• To round a number, look at the digit to the right of the

nadya68 [22]

Answer:

2. A) 37 B)160 C) 110

The tens digit is 10,20,30,40,50,60,70,80,90. Two away to the left of a decimal point.

3. A)730 B) 675 C)1930

The hundreds digit is three from the left of a decimal point.

4. A) 0.40 B)74.60 C)15.20

The tenth is one away to the right of the decimal.

5. A)1.210 B) 3.430 C)0.350

The hundreth is two away to the right of the decimal point.

Explanation:

If it is above 5 you bring the digit before it up by one, if it is under 5 you bring the digit that is under 5 to zero.

8 0

3 years ago

Kruka [31]

Answer:

it is to help me out but the answer is 59-=9x67-=7

Step-by-step explanation:

the answer is 7

7 0

3 years ago

Read 2 more answers

Some help me please?

Lorico [155]

Answer:

I do not know

Step-by-step explanation:

3 0

3 years ago

Applying the Procedure

Verizon [17]

Answer:

15 Square Inches

Step-by-step explanation:

Volume of the cone=40 cubic inches

Height of the cone=8 Inches

<u>Step 1:</u> Applying the formula for the volume of a cone

Volume of a Cone $=\frac{1}{3}\pi r^2 h=\frac{1}{3} X $Base Area X Height$

<u>Step 2:</u> Substituting values for the variables

$40=\frac{1}{3} X $Base Area X 8$

<u>Step 3:</u> Simplifying the right side

$40=\frac{8}{3} X $Base Area$

<u>Step 4:</u> Multiplying by the reciprocal

$40X\frac{3}{8}=\frac{8}{3} X\frac{3}{8} X $Base Area\\$

<u>Therefore, Base Area of the Cone=15 Square Inches</u>

<u />

8 0

3 years ago

Solve the triangle.<br> A = 46°, a = 31, b = 27

Veronika [31]

Step-by-step explanation:

a=31

b=27

A = 46 degree

now, Area of ️ABC =ab siny÷2

=31×27 sin46÷2

=301.04371 .

5 0

3 years ago