2. a random sample of 100 observations from a normally distributed population possesses a mean equal to 83.2 and a standard deviation equal to 6.4. (1) find a 95% confidence interval for .

95% confidence interval would be (81.95,84.45).

Step-by-step explanation:

Since we have given that

n = 100

mean = 83.2

Standard deviation = 6.4

So, At 95% confidence interval, z = 1.96

so, interval would be

Hence, 95% confidence interval would be (81.95,84.45).

i dont know and i dont care for math bc it is a stupied subject

step-by-step explanation:

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!