The IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a) What i

Discussion in 'Calculator Requests' started by math_celebrity, Jan 8, 2017.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    The IQ scores are normally distributed with a mean of 100 and a standard deviation of 15.

    a) What is the probability that a randomly person has an IQ between 85 and 115?
    b) Find the 90th percentile of the IQ distribution
    c) If a random sample of 100 people is selected, what is the standard deviation of the sample mean?

    a) 68% from the empirical rule calculator
    b) P(z) = 0.90. so z = 1.28152 using Excel NORMSINV(0.9)<br />
    (X - 100)/10 = 1.21852
    X = 113 rounded up
    c) Sample standard deviation is the population standard deviation divided by the square root of the sample size
    15/sqrt(100) = 15/10 = 1.5


Share This Page


Related pages


sin 2piesimplifying rational exponents calculatorhow do you do literal equationsbase 8 subtraction calculatorheptagon angle sumsquare root calculator with radicalssolve two simultaneous equationsconvert micrometer to inchesdividing roots calculatorgallons and cupsstandard to slope intercept calculatorgraph hyperbola calculatorabsolute value equations solverthe nearest centalgebraic fractions simplify calculatorlcm calculationcondense each expression to a single logarithm calculatorpolynomial long division solversimple punnett square problemsdistance rate and time formulamultivariable calculatorlcmcalculatordistributive property with integersconvert cups to litercalculate sides of octagonradius of a circle from circumference calculatorgrams to grams stoichiometry calculatordividing by monomialsmultiplication step by step calculatorfind the perimeter of a triangle with vertices calculatorfurlong to yardsgreatest common factor of 36 and 54calculator algorithm212area codeadding and subtracting basesequations of motion formulascofunctionsimplify inequalities calculatorsimplifying a product of radical expressions calculatorcalculate elapsed timesimple deposit multiplierhow to solve mixture problems in algebraprime factorization of 255integer story problemsbinary equivalent calculatorfind vertical asymptotes calculatorslope calculator with stepsvertices faces and edgesphonetic alphabet armyexpand the logarithmic expression calculatormaths combination formulaexpanded form calculator onlineproportion calcwebsites for solving math problemsgraphing system of inequalities calculator onlinefractions in simplest form calculatorfinding complementary and supplementary anglesstraight-line method of depreciation calculatorsolutions of inequalities calculator2infinitycalculate markupcreate a punnett square onlinelifo calculation formularadius diameter calculatorthe additive inverse propertywhat is the volume formula for a cubeextended euclid algorithmsimultaneous linear equations calculatorhow to perform synthetic divisionalgebra step by step calculatorsolving using quadratic formula calculatorstandard form to vertex form calculator with steps