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3 years ago

PLEASE HELP ASAP. ILL GIVE BRAINLIEST IT'S DUE IN 20 MINUTES AND I'M STRUGGLING . HELP ME OUT PLEASE

Mathematics

2 answers:

Elina [12.6K]3 years ago

6 0

Answer:

Step-by-step explanation:

mods are dum LOL

Your answer has been removed because it was incomplete or incorrect. We know you were excited to help, so please repost and make sure to include any necessary explanations and details. That way other students will better understand your answer. Check out what makes a great answer here: https://faq.brainly.com/hc/en-us/articles/360010136959-Answering-Guidelines ߷Your answer has been removed because it was incomplete or incorrect. We know you were excited to help, so please repost and make sure to include any necessary explanations and details. That way other students will better understand your answer. Check out what makes a great answer here: https://faq.brainly.com/hc/en-us/articles/360010136959-Answering-Guidelines ߷Your answer has been removed because it was incomplete or incorrect. We know you were excited to help, so please repost and make sure to include any necessary explanations and details. That way other students will better understand your answer. Check out what makes a great answer here: https://faq.brainly.com/hc/en-us/articles/360010136959-Answering-Guidelines ߷Your answer has been removed because it was incomplete or incorrect. We know you were excited to help, so please repost and make sure to include any necessary explanations and details. That way other students will better understand your answer. Check out what makes a great answer here: https://faq.brainly.com/hc/en-us/articles/360010136959-Answering-Guidelines ߷

disa [49]3 years ago

4 0

The answer to 1 is B and the answer to 2 is A.

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2 years ago

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3 years ago

A flashlight battery manufacturer makes a model of battery whose mean shelf life is three years and four months, with a standard

Vladimir [108]

Answer:

17,065 of those batteries can be expected to last between three years and one month and three years and seven months

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem:

I will calculate the time in months. Each year has twelve months.

Mean shelf life is three years and four months, with a standard deviation of three months. So

$\mu = 3*12 + 4 = 40$

$\sigma = 3$

Proportion lasting between three years and one month and three years and seven months:

This is the pvalue of Z when X = 3*12 + 7 = 43 subtracted by the pvalue of Z when X = 3*12 + 1 = 37

X = 43

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{43 - 40}{3}$

$Z = 1$

$Z = 1$ has a pvalue of 0.8413.

X = 37

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{37 - 40}{3}$

$Z = -1$

$Z = -1$ has a pvalue of 0.1587.

0.8413 - 0.1587 = 0.6826

Out of 25,000 batteries:

68.26% of the batteries are expected to last between three years and one month and three years and seven months.

0.6826*25000 = 17,065

17,065 of those batteries can be expected to last between three years and one month and three years and seven months

6 0

3 years ago

PLEASE HELP ASAP. ILL GIVE BRAINLIEST IT'S DUE IN 20 MINUTES AND I'M STRUGGLING . HELP ME OUT PLEASE ​

PLEASE HELP ASAP. ILL GIVE BRAINLIEST IT'S DUE IN 20 MINUTES AND I'M STRUGGLING . HELP ME OUT PLEASE