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3 years ago

Plz help I will give brainliest!

Mathematics

2 answers:

elena55 [62]3 years ago

6 0

Answer:

b, 1 5/8

Step-by-step explanation:

the area is 4 15/32 square meters, and you find the area by doing length x width. the length is provided, 2 3/4. so all you have to do is divide 4 15/32 by 2 3/4 and you get 1 5/8

sergejj [24]3 years ago

5 0

Answer:

B. 1 5/8 m

Step-by-step explanation:

Convert the mixed numbers to improper fractions by multiplying the whole number by the denominator and adding the numerator (4 *32)+15 = 143

Put this answer over the numerator (32)

(2*4)+3 =11

Put this over 4

Multiply 143/32 by the reciprocal of 11/4 which is 4/11

572/352

divide each number by 44 getting 13/8 which is 1 and 5/8

You're dividing because to get are you have to LW so to get width you would have to divide the area by the length

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Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sampl

kompoz [17]

Complete Question

Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sample of 15 students, the professors find the mean number of headaches is 19 and the standard deviation is 1.7. Assume the population distribution of number of headaches is normal.the correct conclusion at $\alpha =0.001$ is?

Answer:

There is no sufficient evidence to support the professor believe

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 18$

The sample size is $n = 15$

The sample mean is $\= x = 19$

The standard deviation is $\sigma = 1.7$

The level of significance is $\alpha = 0.001$

The null hypothesis is $H_o: \mu = 18$

The alternative hypothesis is $H_a : \mu > 18$

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$Z_{\alpha } = 3.290527$

The test hypothesis is mathematically represented as

$t = \frac{\= x - \mu }{ \frac{\sigma}{ \sqrt{n} } }$

substituting values

$t = \frac{ 19 - 18}{ \frac{1.7}{ \sqrt{15} } }$

$t = 2.28$

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