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Dmitrij [34]
3 years ago
13

Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a

standard deviation of 10 hours. If the manufacturer of the battery is able to reduce the standard deviation of battery life from 10 to 9 hours, what would be the probability that 16 batteries randomly sampled from the population will have a sample mean life of between 70 and 80 hours
Mathematics
1 answer:
Orlov [11]3 years ago
3 0

Answer:

idek

Step-by-step explanation:

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Helpp I’m confused pleasee!
Natasha_Volkova [10]

Answer:

8x

Step-by-step explanation:

5 0
2 years ago
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What is f(x)=x2-8x+11 written in vertex form
denpristay [2]
The answer is (-4,-5) :>
4 0
3 years ago
Which of the following algebraic expressions is not simplified?
AlladinOne [14]

Answer:

Option D. a^2+6ab-2ba

Step-by-step explanation:

Option D because we have like terms: 6ab and -2ba=-2ab, then

a^2+6ab-2ba=a^2+6ab-2ab

Simplifying on the right side of the equation adding like terms:

a^2+6ab-2ba=a^2+4ab

6 0
3 years ago
February 29th is on Sunday. on what day will the next February 29th be?​
krek1111 [17]

Answer: Friday

Step-by-step explanation:

If February 29th is on a Sunday, then, the day that the next February 29th will fall on will be Friday.

First and foremost, we should realise that February has 28 days but in leap years which takes place every 4 years, it has 29 days.

We should realise that the dates in the calendar are arranged in such a way that if a particular date falls on a particular day this year, the date will fall on the next day next year. e.g. since January 20 falls on. Wednesday this year, it will fall on a Thursday next year.

Since February 29 is a date for a leap year, following the above explanation, if February 29th is on a Sunday, then, the day that the next February 29th will fall on will be Friday which is in the next four years.

4 0
2 years ago
Simplify: (2x2 − 9x + 3) + (−7x2 + 4x − 2)
Leokris [45]
Combine like terms
2x^2 + -7x^2 = -5x^2
-9x + 4x = -5x
3 + -2 = 1
put back together
-5x^2 - 5x +1
4 0
3 years ago
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