Karla bought 2 pounds of red beads , 1 3/4 pounds of green beads , and 10 ounces of string at the craft store. How much do Karla
2 answers:
Answer:
Karla's supplies weigh in all 4.375 pounds or 70 ounces.
Step-by-step explanation:
Karla bought red beads = 2 pounds
green beads = pounds or 1.75 pounds
String = 10 ounces or 0.625 pound
1 pound = 16 ounces
First we convert each product's weight in pounds
red beads = 2 pounds
green beads = or 1.75 pounds
string = 10 ounces 10 ÷ 16 = 0.625 pounds
Total = 2 + 1.75 + 0.625 = 4.375 pounds
4.375 × 16 = 70 ounces
Karla's supplies weigh in all 4.375 pounds or 70 ounces.
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Answer:
a) A. The population must be normally distributed
b) P(X < 68.2) = 0.7967
c) P(X ≥ 65.6) = 0.3745
Step-by-step explanation:
a) The population is normally distributed having a mean () = 64 and a standard deviation (
) =
b) P(X < 68.2)
First me need to calculate the z score (z). This is given by the equation:
but μ=64 and σ=19 and n=14,
and
Therefore:
From z table, P(X < 68.2) = P(z < 0.83) = 0.7967
P(X < 68.2) = 0.7967
c) P(X ≥ 65.6)
First me need to calculate the z score (z). This is given by the equation:
Therefore:
From z table, P(X ≥ 65.6) = P(z ≥ 0.32) = 1 - P(z < 0.32) = 1 - 0.6255 = 0.3745
P(X ≥ 65.6) = 0.3745
P(X < 68.2) = 0.7967