If a sample has 60 participants and is a proportion of p=0.25 of its population, then what is the standard deviation of the sample?

If a normal distribution is considered, a standard deviation (SD) is accounted for 34% (0.34 of population).

60 participants <=> p = 0.25

SD                     <=> p = 0.34

=> SD = 60 x 0.34/0.25 = 81.6 = ~82 participants.

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rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500