Alice was told that her reading test score was 1 standard deviation below the mean. if test scores were approximately normal with μ=86 and σ=4, what was alice's score? do not include units in your answer. for example, if you found that the score was 86 points, you would enter 86.

82

Step-by-step explanation:

Given that the population mean  μ=86 and standard deviation σ=4 then one standard deviation below the mean means  4 less than 86 which is 82.

or

One standard deviation below the mean means z=-1 where z* is the z*score value in the standard normal distribution

Apply the formula

z=(x-μ)/σ

where x=Alice's score

          μ=estimate mean

          σ=standard deviation

z=(x-μ)/σ

-1=(x-86)/4cross multiply

-1*4=x-86

-4=x-86

-4+86=x

82=x

i think it would be 43 movies that would have to be watched.

step-by-step explanation:

think about it. for the second plan, every month is 8 dollars. 8 x 12= 96. so thats the number for the second plan. now for the first plan, its annual meaning you have to pay 10 dollars every year. so now you have to get an equivalent amount of 86 since 96-10=86. 86 divided by 2 since every movie costs 2$ then you would have to watch 43 movies a year to get the same as the second plan. i really hoped this . have a wonderful day as well!

a

step-by-step explanation: