What is 2/9x35 pls answer I don’t get it

4. On a trip to the movies a family spent $40 on tickets, and another $25 and popcorn. They also spent $10 on drinks. the oldest

Vesnalui [34]

The oldest son spent $10 on candy. 40 + 25 = 65 + 10 = 75 then the other 10 was spent on candy by the oldest son

8 0

4 years ago

Families USA, a monthly magazine that discusses issues related to health and health costs, survey 19 of its subscribers. It foun

s344n2d4d5 [400]

Answer:

a

$10,151 $< \mu$ $11448.12

b

$n = 158$

Step-by-step explanation:

From the question we are told that

The sample size is n = 19

The sample mean is $\= x =$ $10,800

The standard deviation is $\sigma =$ $1095

The population mean is $\mu =$ $225

Given that the confidence level is 99% the level of significance is mathematically represented as

$\alpha = 100 -99$

$\alpha = 1$ %

=> $\alpha = 0.01$

Now the critical values of $\alpha = Z_{\frac{\alpha }{2} }$ is obtained from the normal distribution table as

$Z_{\frac{0.01}{2} } = 2.58$

The reason we are obtaining values for $\frac{\alpha }{2}$ is because $\alpha$ is the area under the normal distribution curve for both the left and right tail where the 99% interval did not cover while $\frac{\alpha }{2}$ is the area under the normal distribution curve for just one tail and we need the value for one tail in order to calculate the confidence interval