Suppose a deli sells morning newspapers at an average of 10 per hour with a standard deviation of 5. use the standard normal distribution.

a. what is the probability that the deli will sell up to 7 newspapers in a given hour?
b. what is the probability that the deli will sell 12 or more newspapers in a given hour?

a) 0.274 is the probability that the deli will sell up to 7 newspapers in a given hour.

b) 0.345 is the  probability that the deli will sell 12 or more newspapers in a given hour.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 10 per hour

Standard Deviation, σ = 5 per hour

Formula:

a) P(deli will sell up to 7 newspapers in a given hour)

P(x < 7)

Calculation the value from standard normal z table, we have,  

0.274 is the probability that the deli will sell up to 7 newspapers in a given hour.

b) P( deli will sell 12 or more newspapers in a given hour)

P(x > 12)

Calculation the value from standard normal z table, we have,  

0.345 is the  probability that the deli will sell 12 or more newspapers in a given hour.

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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!